Included in this crowd are a dog, a zombie construct, and at least one lesbian.
Yes, yes, we all knowGirl-On-Girl Is Hot. But what some authors are only just beginning to realize is that, forcertain women (and of course,certainguys)Guy-On-Guy Is Hot. While not a ubiquitous cultural assumption inReal Life the way itsSister Trope is, it is nevertheless an existing mentality. It's the reason forYaoi, and the times whenHo Yay is played intentionally forFetish Fuel. Some authors adhere to this, or at least acknowledge its existence, and thus we get scenes ofhalf-naked menwrestling in eithermud orjello.
In fiction, this philosophy may be treated in-universe as a full-onSpear Counterpart toGirl-On-Girl Is Hot, with the assumption being that it's normal for women to ogle gay men in the same way that straight men (supposedly) enjoy lesbian action.
Just as often, though, there is a heavyDouble Standard; straight men thinkingGirl-On-Girl Is Hot will be taken for granted, whereas the female enjoyment of Guy-on-Guy will be treated as a perversion (SeeYaoi Fangirl). Or, in the other direction, female characters will proudly declare their fascination with gay guys doing it while denouncing men who eroticise lesbians as exploitative perverts. This probably comes from the times when polygyny was a thing - it wasexpected for women to kiss to arouse the sole male, but multiple men acting out gayness for a girl was generally seen as weird and a sign of male weakness (since, y'know, sharing a girl).
InNaruto, Konohamaru's Sexy No Jutsu had two shadow clones transform into a nude Sasuke and Sai lockedin a very suggestive pose. It got cut in the anime, but the manga version can be seenhere. In the English print of this manga scene, the male on male part was nearly blacked out entirely, while the girl on girl scene only needed a few extra clouds to censor naughty bits. MajorDouble Standard onVIZ's part. Remember kids; getting the hots for naked ladies together is okay, but you're not allowed to even look at two guys. EVER!
Ohno and Ogiue fromGenshiken love their yaoi, although the latter is loath to admit it at first.
This trope is a large part ofAxis Powers Hetalia 's raison d'être.France spends most of his time stripping and/or groping the other male characters, Italy has a habit of glomping or sleeping with Germanywhile naked, and the series even has its own residentYaoi Fangirl, Hungary.
InThe Princess Diaries 2 (which is aDisney movie aimed at pre-teen girls,just so we're clear), there is a scene where Mia and her best friend Lilly are looking at prospective princes. Mia remarks that one prince shown is cute, to which her bodyguardJoseph replies, "His boyfriend thinks so too." Mia and Lilly's reaction is... enthusiastic.
InThe Pink Panther Strikes Again, when Clouseau is attempting to revive Dreyfus at the insane asylum (from behind), two women mistake him forattempting to make out with him. The older one snaps, "Don't look, Fiona!" but Fiona, the younger one, seems pretty eager to watch what she thinks is two guys going at it.
Literature
Anita Blake. Two guys together gets Anita and Belle Morte off.
Live-Action TV
There was an episode ofSex and the City where the girls rent gay porn for this reason and watch it together.
Buffy the Vampire Slayer once suggested putting her two vampire ex-boyfriends in a room together and have them wrestle in the nude while she watches. She then added, interestedly, "There could be oil involved." Note that this trope is a view held bymuch of the show's fanbase as well.
There was a skit onThe Chris Rock Show where two men cross paths on the street and it looks like they're about to fight... and they make out instead. All you can hear from the audience is womensqueeing. You can watch ithere (even if the end was just spoiled out of necessity). While hilarious, the clip is sadly a case ofDid Not Do the Research, as racial bias and tension have long been a sore point in the gay community.
State of Play. A homosexual member of the newsroom mentions he just slept with the man they've been investigating. When he asks if they want him to go into detail the men immediately say "No!" while the female journalists have exactly the opposite response.
In oneFriends episode, Rachel had anErotic Dream that featured Chandler. Later, it also included Joey, then Rachel mentions that sometimes it wasjust Chandler and Joey. The guys leer until they realise what that means.
In the Tudor Porn sketches inMonty Python's Flying Circus, Sir Philip's wife is fond of reading "Gay Boys in Bondage".
Saturday Night Live has a recurring skit called the "Kissing Family" which features a considerable amount of intense guy-on-guy kissing. Inevitably there will be squeals of delight which overpower the laughter.
Jack: We'll have a steak, watch a movie... you like gay porn, right? Grace: Who doesn't?
Noah's Arc: Brandy finds two guys together quite sexy, though overall the trope goes without saying for the LGBT genre (at least on the male end).
In theFarscape episode "Won't Get Fooled Again", one of the many crazy scenes involves aCamp Gay D'Argo propositioning John. Apparently Chiana wants to watch...
One of thePatients of the Week onGreys Anatomy was a gay soldier. Once his boyfriend comes to visit him they are alone and proceed to make out. Meredith Grey walks by, and stares at them with much interest.
Music
Why doPanic At the Disco have so many fans, you ask? Half for the awesome music and 99% for theFaux Yay/Ho Yay between all the hot guys.My Chemical Romance have a large female fanbase for the same reason.
Take That used to do lots ofHo Yay moments that extended tonaked pics in their early days as well, but recently they stopped because they want a wider audience. Needless to say, many of their female and gay male fans left.
Possibly the whole idea of the Japanese gameCho Aniki , aBullet Hell shooter similar toGradius, that isloaded with big, muscular guys wearing speedos. As in,your character is one, most of the enemies are ones, and the bosses arehuge ones. This actually goteight sequels in Japan. WhileWord of God has never outright stated that the Trope fits, it's clearly aMacho Camp theme.
In order to force Ethan to get together with a guy who previously called him out on his jerkish behaviour, Robin adds a clause to the anti-cancer bill she's trying to get through Congress that will force the two to make out at least once a week. As soon as she does, the bill gains significant support among women.
Amber repeatedly expresses enthusiasm for anything which results in two dudes getting it on.
InSkin Horse, Tip and Konstantin mud-wrestling have attracted quite an audience, including a Kinsey-Seven[1] Lesbian and a sentient swarm of bees.
InQuestionable Content, Steve and Marten admit to having drunkenly made out at one point. Dora and Faye's reaction? "RECREATE THIS.NOW."