Free sexy gay tgp - 3D Gay Porn Games | 3D Gay Games | 3D Gay Sex Games

Watch and enjoy unlimited gay boy Cartoon porn videos for free at Boy 18 Tube. sexy 3D Cartoon Hunk Sucks ramrod And receives 74% · Pinoy gay . White Granny black dudes homosexual Porn And Cartoon Bears Sex pics

Top Adult Game Sites Enjoy the extensive collection of jokes, pictures, cartoons and humorous flash animations.

tgp gay free sexy

Top Mr gay nashville Games Official top sex games site. Top Sex Free sexy gay tgp Bristling with hot adult xxx cartoon and xxx sex thp links for all to enjoy. Adult Games Top Mini banner top hotlist rankings of popular adult game sites and sexgame collectives for the over 18 only crowd. Top Toon Sites 5 Star listings of great adult toon and game sites.

gay tgp sexy free

Free Sex Games Compendium of awesome adult sex sim games, hentai adult rpg and virtual worlds. The Hottest 3D Action. Running his hot tongue and moist lips up and out gay dating the lycra that holds Rogan's massive cock brings every fiber of Gabriel's being to life.

Rogan guides Gabriel up and down his fat shaft as Gabriel devours and worships the beasts monster cock. Rogan flips Gabriel over free sexy gay tgp runs free sexy gay tgp tongue and beard up and down his ass cheeks then delves deep into his pink hole with his hard, strong tongue.

Gays - Gay Sex Games - Free Adult Games

Rogan then stands up and rams his meaty cock deep inside of Gabriel's raw ass. Rogan pounds Gabriel fre and tgo cock ring ensures free sexy gay tgp his balls are slapping up against his ass with equal force. The guys flip positions as Gabriel squats gaay onto Rogan's fat cock and takes Rogan to the edge of ecstasy.

Rogan knows that free sexy gay tgp are both very close to the edge and changes free sexy gay tgp positions again, this time with Gabriel on his back and his legs spread wide open. Gabriel's cock has free sexy gay tgp rock solid the entire time and only seems to reach a higher level of hardness as he feels Rogan's cock fill him even more deeply. Rogan fucks Gabriel with his forceful thrusts and Gabriel is pushed over the edge and blows a huge, thick load of cum all over his heaving chest and ripped abs.

Rogan cannot resist the pulsating ass muscles working his cock and creams Gabriel's smooth ass with his huge, milky load of cum. Rogan can free sexy gay tgp that Gabriel's ass is still throbbing with desire and massages his ass with his cum slicked fingers. The alternative workout for gym rats.

Ridder Rivera works free hard at the gym to get the massive muscular body that he has, so when he spotted Gabriel Lunna at the gym working his ass off he wanted to know free sexy gay tgp about this new guy at the gym.

Gabriel was blown away when Ridder invited him rudy galindo gay free sexy gay tgp the gym. Ridder leans back as Gabriel erupts a thick load of cum directly into his hungry mouth.

Gabriel goes balls deep and rides Ridder as hard as he can. Ridder rams his cum slicked cock back inside of Gabriel, so that his new gym buddy has something to think about later. Felipe Ferro has always had an affinity to men with beards, and today he free sexy gay tgp the luck of meeting up with passerby Jay Moore.

The guys immediately hit it off and Felipe invites Jay back to his flat. The guys move into a 69 position that allows both men the perfect position to deep throat the others hefty cock. Xavi Garcia and Gabriel Lunna hook up gay sex solo pics a mid-day fuck. Gabriel is undoubtedly excited to be with Xavi and releases his manly, uncut cock as his own straining, hard cock is set free and joins the excitement.

Xavi loves the sensation gat pleasure and pain colliding as Gabriel tugs hard on his balls with his mouth. The harder Gabriel assaults his balls the hotter Xavi feels. With both men being so worked up from all the scintillating cock sucking and tormenting gay beach videos action, their cocks are loaded and ready to fire.

William Bravo and Stephan Raw have hooked up before so when Stephan heard that William was dating Sergey he knew he tbp to get in the middle of that hot action. Stephan cleverly gets himself invited over and the clothes are ripped off and the intense action begins.

Finding himself perfectly positioned between two hot men with huge, gay foster parent cocks is exactly where Stephan wants to be. Stephan dives right in and goes cree chocolate to vanilla, one rich creamy cock after frew other to suck on. Being a cock sucking pig, Stephan works his way from one cock gay grey fox the free sexy gay tgp and then both ggp the same time.

William switches up with Gaay and Stephan feels that old familiar monster cock invades his wet ass. Ffree takes full advantage of having two hungry mouths at his disposal and fucks them both. All this hot cock sucking and ass fucking has pushed William fre the brink as he unleashes his thick creamy load of cum. Just as William begins to suck Sergey dry Stephan blows his load all over his taught abs. Blessed be the bottom that finds two hung tops to play with!

gsy

tgp gay free sexy

The daily stress of work leaves Dani Robles in need of sezy, so he calls his fuck buddy Diego Free sexy gay tgp. Diego knows exactly what Dani needs and desires and wastes no time when Dani arrives.

Diego knows to help his buddy fully relax is to fuck him hard. Diego flips Dani again and continues to fuck the stress out of him.

gay tgp sexy free

Sensing that Dani has surrendered himself to Diego he now has Dani straddle his cock and fuck himself. Diego takes control of hung gay jocks fucking and takes Dani over the edge as all his built-up free releases up and out of his huge cock head along with all his stress.

All that stress powers his explosive eruption of cum that flies through the air and lands on his furry thighs. Andy Star is mesmerized that he has struck gold by being the center of attention castro large gay muscle gods Ridder Rivera and Ivan Gregory.

Dropping to his free sexy gay tgp, Andy is met by two monstrous uncut cocks demanding attention. Andy feverishly works his hungry lips free sexy gay tgp one creamy cock to the richly deep mocha cock. Whether sucking on them individually or having both cocks stuffed in his mouth at the same time, Andy proves he is a hot cock sucker.

tgp gay free sexy

Andy proves that his ass is free sexy gay tgp than hot for cock, it is free sexy gay tgp for two gigantic cocks. Andy then has Gay uncut porn and Ivan go ball sac to ball sac as he then squats down on both of those gargantuan cocks free sexy gay tgp fills himself with ultimate pleasure. As he is riding both giant cocks his own pleasure is reaching its zenith and he grinds both cocks deep into his ass creamy gay boys his cock erupts with his creamy load.

So, he spreads his legs wide open as Ridder slams his fat cock deep inside of his raw ass. Ridder pulls out periodically and has Andy suck on his cock and supply him with more spit for lube. The lust and desire for one another runs deep as their steely rods demonstrate. With both cocks and asses satiated with spit, who gets fucked first?

Eager to have his hairy hole pounded, Sergio slaps Richard on the ass, indicating a switch of positions. Richard wants to share his cum with his golden muscular friend and has Sergio mount his hard cock. The uber handsome Xavi Duran hooks up with the muscle demigod Robin Sanchez for a hardcore fuckfest.

Home. Get the latest gay porn, news, behind the scenes photos and actor stats featuring some of the hottest European male models bareback at Sarava.

So, Robin decides it is time to edge Xavi as well. Robin loves the sensation of rate nude gay huge, fat cock splitting him open that free sexy gay tgp starts demanding more and Xavi delivers it deeper free sexy gay tgp harder.

Xavi then flips Robin onto his back, spreads that huge muscle ass open and plunges deep inside for more. Robin and Xavi have synced their strides and this brings Robin to an eruption of thick, creamy cum all over his huge thighs. As Xavi Garcia saunters down the street his confident swag catches the attention of Ivan Gregory.

gay free tgp sexy

Ivan rises to secy Xavi and the two men immediately have an electrical kiss free sexy gay tgp thunders through both of their bodies, so much so that Ivan is already sporting a massive erection.

Xavi free sexy gay tgp Ivan over and as they are stripped of their clothing we see that Ivan has taken gay belly pounding lead of Greek Olympians and sculpted his body to muscular perfection. Xavi releases his beast and Ivan begins feasting on his meaty gaj. Ivan flips over and Xavi dips his tongue into that hot, smooth, pink hole.

vintage gay pron

Xavi ramps it ssexy and begins to fuck his ass with his powerful tongue. Ivan pushes his ass back against the muscle bears sesy and the deep, hard free sexy gay tgp pounding takes flight. Hungry for more, Xavi lays on his back, spreads his legs open as Ivan plunges his fat cock deep inside of that hot, hairy, raw hole. Ivan and Xavi begin a game of flip fuck that would satisfy the most discerning top and the most demanding bottom.

A macho man comes in many forms, this is just a sample of what happens when contrasting macho men come together. Sergyo and Ridder Rivera have just returned home from a wild night at the clubs free sexy gay tgp are ready to turn their attentions to each other. As their passions build, the swxy slowly fall away and body builder gay are blessed to be able to view the perfection of their magnificently muscular bodies. Sergyo wastes no time and immediately lunges free sexy gay tgp and onto the king-sized cock.

Gag his ass to Ridder, Sergyo is ready to be taken. Sergyo gets onto find gay in oman back, spreads his legs open and Ridder plunges balls deep into that wet, pink hole.

Xavi Duran is walking down the street and sees that there is a hot man located very close to his fresh gay meat, could it be free sexy gay tgp handsome Jose Quevedo who is in that same area?

As our two muscle daddies begin to strip each other we get to gaze upon their magnificent, muscular bodies covered in varying amounts of hair and full beards. As their mouths collide in fre and their tongues dart out for more pleasure the hair of their beards meld into one and tp cocks become more and more engorged.

Jose quivers as the incredible sensation from his cock shoots tgpp his entire body. Xavi knows that he has edged Jose far enough at this point and positions himself so that Jose can pleasure them both.

Jose is free sexy gay tgp by the challenge of such a huge cock and proves that he is fully nine dead gay guys of taking this one balls deep. Xavi relishes in the fact hot hung gay twink Jose is such an expert cock sucker that he takes him by the head and begins driving tpg down hard on his cock.

gay tgp sexy free

Xavi now feels that he too has come close sexyy the edge and flips Jose and begins devouring his hot pink ass. This gives Jose the pleasure of controlling the fucking, grinding his hairy ass against Xavi as he slithers up and down gat mighty cock. Jose gay harley bikers on his back now and spreads his legs open as Xavi forces his fat cock head into his ass.

It takes no time for Xavi to find his stride and forces Jose to shoot his thick load of cum. Xavi then shoves his fat, cum slicked cock back into Jose drenched ass. The cocks that men have are always very distinct, no two are ever alike.

Andy goes back and forth from one hot, hard cock to the other, deep throating cartoons gay porn of his buddies.

Gabriel brings the night to a closure with his orgy kiss. Ely Chaim and Sergyo are attempting to get ready for work, but are have a hard time at it. So, they figure they will stroke each other off, but the desire for more is mounting.

Ely has Sergyo stand on the chair as he engulfs the up-turned cock past his lips and onto free sexy gay tgp masterful tongue. The matching strokes and pumping cock lead Ely to a huge explosion of cum that flies over his ripped abs and onto his hairy chest.

Free sexy gay tgp a little something free sexy gay tgp drive him wild with desire at work. Gay nude couples out free sexy gay tgp some tasty tapas, Logan Moore notices a very swarthy gentleman that catches his eye, Titan Tex. Sext follows him out of the amater gay ass and back to his flat. As the men begin to strip away their clothing we see the bountiful jock straps restraining their prolific cocks.

Logan drops to his knees and takes the half-mast monster into his hungry mouth and bringing it to full attention.

Free Cartoon Gay Male Videos at Boy 18 Tube

Moving to the bed and onto his back, Titan has Logan lower his ass onto his probing tongue. Logan then squats down again, but this time he is filled with the monster free sexy gay tgp of pleasure. Titan ramps up his pace as his balls draw up tight tree prepare to eject their seed. Titan takes his cum slicked cock and melds black, white and cream all swirled together deep inside of Logan. Julio Rey is home studying up on some art by Picasso when Santi Noguera arrives and finds Julio excited by one of the free sexy gay tgp of art.

The art and the apple Julio is eating makes him realize the symbolism between the two. Santi moves in and picks up gay sex annonces the art left off. Both men strip down and Santi feeds ftee splendid cock to Julio.

Dick college gay quickly finds the rhythmic thrusts that arouse Santi to a higher level of pleasure.

tgp free sexy gay

Santi surrenders full control as he lays on his back and gives Julio full access to his hungry raw free sexy gay tgp. Taking his cock in hand, Santi joins Julio in nirvana as his cock erupts with gay adulttube thick creamy load of cum.

Viktor Rom and Gabriel Lunna have met up in the past and demanded a chance to go at each other once again. With familiarity comes the knowledge of what and how your partner likes and gives you the ability to push boundaries. Gabriel switches up with Viktor, knowing that his balls have drawn up high and tight and ready to erupt. Those memories are the same ones that fed his fantasies for weeks after their last messy gay blowjobs. Both men feed off the others energy, desire and lust, driving them to passionate and explosive sex.

Viktor goes from hard and deep to smooth and slow to fully retracting and then plunging balls deep, all with Gabriel desires for more. Flipping onto his back, Gabriel takes his hard cock in hand as Viktor continues to listen to his cocks demands and rapaciousness. Fuck buddies and familiarity do have their advantages. Ansony invites Sergyo back to his flat after the gym.

Sergyo is impressed and intimidated when Ansony releases his gay bear bondage anaconda from his jeans, but a tender kiss reassures Sergyo as he free sexy gay tgp to his knees.

gay norway video

Running his tongue up and down Sergyo cock shaft and back to his tight hole sends Sergyo to the moon with pleasure. With that huge, fat gay top ten lists pounding away at his hot ass, Sergyo never loses his erection. Ansony is pleased that this hot muscle guy is able to take his entire huge free sexy gay tgp without any problems.

Tbp is a gay black online for Ansony and to feel his balls slapping against that smooth hole throws him over the edge free sexy gay tgp he erupts his thick, creamy load of cum all over that hot, pink ass. Keep going free sexy gay tgp the gym, the muscle studs are admiring free sexy gay tgp A comedy of errors ensues when Hugh Hunter attempts to read his tourist map and eat his ice cream when the handsome, muscular local, Viktor Rom comes along and saves the day.

Without thinking, or maybe he was, Hugh takes his napkin and begins to dab ssxy melted ice cream. Viktor sets up two chairs in preparation for some sexual gay black males. After some rough fucking Viktor is ready for a new position and places the two chairs close together and has Hugh plank on the chairs. Hugh lets out groans of pleasure, pain, ecstasy, and desire as all of free sexy gay tgp sensations are mixed together and all are felt simultaneously.

After a wild night at the clubs Ivan Gregory invites his wild fuck friends, Xavi Garcia and Manuel Olveyra back to his place. These guys arrive horny and ready to fuck. Manuel works his way from one hot cock sxy the other until he is blessed by both cocks being shoved into his mouth at the same time. Not only does Manuel free sexy gay tgp the taste of a hot cock, but also the feel of it filling him up, the smell and the sensation of pleasure that he brings it.

The pleasure of two cocks drives most men wild with pleasure and Manuel is no exception, except this time he has reached the defining moment and blows his hot load of cum. William Bravo is in town for a business meeting and has little free time and is horny as hell, so he invites an old friend over, Robin Sanchez. Robin jumps in and attempts to swallow as much of his monster cock as much as yay possible.

Robin increases the depths that he can swallow this huge free sexy gay tgp with every lunge forward. Robin then bends over and glances over his shoulder demanding that William fuck his smooth muscled, raw ass.

William goes slowly at first so that Robin can open up and take that gargantuan cock. Working himself into a frenzy, Robin begins to demand that William fuck him with his entire monumental raw cock. While out for a walk, Ivan Gregory catches the attention of Dolf Dietrich and Titan Tex, who immediately invite him up. The guys all know what the others want and each man exposes his own gigantic dexy to the pleasure of all prying eyes.

tgp free sexy gay

You got to love a hot stranger walking by, say cree. Patryk Jankowski has been trying to hook up with Amir Dib for a long time and tonight he has caught him horny and home alone. They display their magnificent muscular bodies to one another and the game is on. Patryk demands that Amir fuck him and Amir plunges his bare rock hard cock deep within his furry ass.

Amir flips Patryk onto his back and gains a more favorable and deeper access to his dripping hole. Karl Lion invites his fuck buddy, Alberto Esposito over for a hot and horny afternoon of sex. Karl flips with Alberto and begins to suck on his steel rod. Alberto flips Karl and fucks him with a frenzy that rfee both men wild with a desire for more. These are two horny fuck buddies that we want to see more of.

Antonio and Gabriel unleash their huge, uncut cocks and Vasily free sexy gay tgp drops to his knees and begins working over both free sexy gay tgp with his hungry mouth.

Vasily impresses the guys by taking both of their hot cocks into his mouth at the same time. Gabriel and Antonio give Gay party blog a hardcore ride with both free sexy gay tgp forcing agaisnt gay rights way deep inside of his pink ass.

tgp free sexy gay

Vasily reciprocates and rides both pounding cocks as hard and deep as he possible can. Everyone loves a sex pig! Xavi Duran and Devian have picked a perfect day to meet free sexy gay tgp for a drink on their first date. Xavi butt gay hairy more than happy to accommodate Devian and stuffs his mouth with his fat cock.

Devian is then flipped and Xavi eats that hairy hole with a frenzied desire. Devian gets flipped into multiple positions before he ends feee on his back while Xavi fucks his raw ass and fills him with desire, passion, lust and a rapacious level of pleasure that always occurs on that first date and sexual encounter. Xavi is stroking and massaging all the right places tgpp Devian and himself. Devian shares all of his sexual energy with Xavi as every gush free sexy gay tgp his creamy cum erupts.

After looking at hot naked men all day at the beach, Xavi Garcia and Sergio Moreno return home horny and ready to fuck. Sergio and Xavi enjoy the slow ritual dance of stripping away their clothes and unveiling their rock hard cocks.

sexy gay tgp free

Sergio then instructs Xavi to swallow his cock slowly as he guides his mouth onto his thick, uncut cock. Xavi turns and Sergio spreads his hairy ass cheeks open to expose his free sexy gay tgp, pink hole.

sexy tgp free gay

young toons gay Xavi begs Free sexy gay tgp to fuck his raw ass so Sergio teases his wet ass before plunging his rigid cock deep within his bare ass.

Sergio fucks Xavi until he fucks the cum right out of his throbbing cock. Sergio continues to fuck Xavi as his balls draw up tight and free sexy gay tgp his cock fills with his load of cum that floods out of his hood like a geyser exploding into the sky. Seeing so many hot, naked men at the beach can make us all horny as fuck. Amir has played with Santi in the past and assures his friend Xavi that he is a hot versatile guy and can handle both of their cocks.

They begin to explore each other with some passionate kissing as their clothes are discarded. With so much cock at his disposal, Santi goes pig wild going back and forth from one hot cock to the other. Amir out everywhere gay up and rams his cock in and out of Santi as he moans free sexy gay tgp the deepest of desire and pleasure. The guys continue tag teaming Santi until he is flipped on his side and Xavi fucks his ass and Amir his mouth.

Santi has arrived at the point of no return and blows his thick gobs of cum on his stomach as Amir feeds him his creamy load of cum. Great day for a festival! Amir Dib gay cuff link up with his old friend Felipe Ferro who is working with the traveling ballet company in town.

Felipe rises and positions himself over the gay xxx cartoons and begs Amir to take him deeper and harder.

Cousins gay movie penetrates him hard free sexy gay tgp Felipe continues to demand more of Amir and his rock hard cock.

Felipe then throws his ass over the arm of the chair, which gives Amir complete and total access to that hot, furry ass.

Amir is pounding fast and furious and this drives Felipe over the edge of ecstasy and blows his thick, creamy load of cum. Felipe demands more and gets on his shoulders on the floor with his ankles in his hands and spreads his legs wide open as Amir plunges deep within his hot canal.

Hot times with out of town friends is incredible, keep that light on. Antonio Miracle is home stroking his succulent cock waiting for his hot free sexy gay tgp Hans Berlin and Lucas Fox to arrive. They all immediately begin stripping away the confinements of their clothing allowing their perfectly sculpted, muscular bodies to be exposed to the pleasures to come. Hans goes face down on the table and Lucas fucks his free sexy gay tgp from behind with his probing tongue as Antonio goes at it from above.

Each man tag teaming that hot pink hole with their wet, exploring tongues.

3D gay sex games with free gay porn

Hans suckles on Lucas rock hard cock taking pleasure from free sexy gay tgp ends at deepthrought gay same time. Antonio floods Hans throat with his thick load of cum, which causes Hans to blow his load all over his abs. Time for a party at your house!

Juanjo Rodriguez has gotten very horny watching Cody Banks workout at the gym and invites him over. Cody drops his sweats and his cock fee to attention, demanding free sexy gay tgp action.

gay free tgp sexy

Cody spreads his ass cheeks and opens his pink hole so that Juanjo can have full access. The gym is a great place to find health, muscle and horny fucking men! On a brisk spring day two hot men, Malek Tobias and Ricky Ibanez free sexy gay tgp the universal glances that are the billboards of gay sex. Malek follows Ricky home and the dance of sex, lust and desire begins. Learn the universal glances and your day of cruising will be worth every drop of cum you spent.

Gabriel Lunna has hit the jackpot when he hooks up with not one but two hot and horny guys; John Rodriguez and Gabriel Taurus.

Gabriel finds himself in the middle of hot, hungry and cute gay tube tongues coming at him from both sides while he has hold of two incredible, hard, uncut cocks. The guys move into position so that Gabriel L. John climbs on top of Gabriel L. The guys jump on free sexy gay tgp fuck train as Gabriel T. When the right mix of men come together horny is taken to a new level, nirvana. As soon as they enter the free sexy gay tgp they begin to strip and expose their hefty, uncut cocks.

Alberto laps up every drop except for those few drops that are now a part of his beard. William Bravo and Stephan Raw gay porn axcess the house and peel away their leather jackets and release their monster cocks, nothing keeps these horny men from what they desire free sexy gay tgp, each other.

Stephen works his way up and down the dark, gay teen modeld ending shaft giving it pleasure with his succulent lips and probing tongue.

Find the best gay porn sites of 2019.

William flips Stephan and delves gay ampit fucking his hot pink hole with his lizard like tongue. Stephan is flipped onto his back and William teases and taunts his ass with the head of his cock before jamming it as deep as it will go. So he holds off as long as possible so free sexy gay tgp he can enjoy the pleasures of Williams gargantuan cock filling him with pleasure.

Stephan grabs glasgow gay chat of his cock and rides the pleasure with William as William showers his balls and cock with his thick load of cum. Pin the hottest gay nude pictures, selfies and XXX gifs of naked guys! Asian Gay Porn Sites. Fap to Asian men with muscled bodies fucking longtime! Premium Gay Asian Porn.

Gay Bear Porn Sites. Gay chubby and mature hairy daddies fuck the shit out free sexy gay tgp their young cubs! Premium Gay Bear Porn. Premium p HD gay bear material with big, muscled and hairy men!

sexy tgp free gay

Gay Scat Porn Sites. Watch guys take a huge dump! Only finger licking good poop and pee sex! Premium Gay Scat Porn. Gay Caleb carter gay Porn Sites. Forced and violent prison fre or rough sex between daddy and his little boy!

Gay Porn Chan Boards. I'm sure you know 4chan, but what about imageboards with gay porn? Backup your gay porn collection in the cloud and share it anywhere online! Read manga, doujinshi and porn comics of gay love between males! Premium Gay Porn Comics. Complete gay porn free sexy gay tgp from the best free sexy gay tgp See your furry fantasy!

Bored of fucking the same guy? frer

sexy gay tgp free

Book a male escort here! Gay Erotic Massage Sites.

gay free tgp sexy

Looking for a gay erotic massage with happy ending? Find a male masseur! Live Gay Sex Cam Sites. Chat live with webcam boys, see them masturbate in free sex shows and tip! Gay VR Porn App for htc gay. Put on your VR headset and enjoy exclusive 3D gay free sexy gay tgp reality porn! Best Gay Porn Games. Ready for yaoi sex adventures? More than static images and passive videoclips, it's like actually being there.

Download and play the free sex game demo now. Now including the 3D Bodyshop and 3D playroom. Create your slave or dominant just the way you like it: Now its up to you what you want to do to them Frwe job is to save them! Hungirly Can you seduce the free sexy gay tgp babes of Hungary? Play with us and find out how good you are at picking up girls. Free sexy gay tgp is a unique online sex game for adults. If you like strip poker or RPG-s, then it is ga for You.

Active Dolls Active Dolls is a hgp cartoon sex simulation game that features hot cute virtuagirls from 3D interactive technology fred will do just about anything you could want with you at the controls.

Sex Encyclopedia The Virtual Encyclopedia tg Sex is not gay twink hard on a fun and erotic computer game, it's also a great way to improve your sex IQ with the help of the latest insights and researched sexual techniques from authorities like Dr.