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'''Airdate:''' March 8, 2009

While on his way to buy groceries, Peter buys a brain-damaged horse instead, which not only creeps everyone out but also causes $100,000 worth of damage when Peter enters it in a race and it goes on a rampage. Though the horse ends up dying of a fatal heart attack and Peter disposes of the body by flinging it into Mort Goldman's Pharmacy, the Griffins are in debt for initial damages. To make money, Peter works as a test subject for medical experiments, being injected with various genes to see their effects; these include the squirrel gene, the Seth Rogen gene (with Rogen himself providing the voice of the transformed Peter), and the gay gene, which turns Peter into a [[CampGay flamboyant homosexual]].
!!"Family Gay" contains examples of ([[YMMV/FamilyGuyS7E8FamilyGay YMMV goes here]]):
* AllGaysArePromiscuous: Peter's partner Scott presents him with a 10-man orgy shortly before the gay gene wears off.
* ActorAllusion: In {{the long list}} of horses named after cancelled {{Creator/FOX}} shows, one of them is named ''TheWinner'', which was produced by SethMacFarlane.
* AmbiguouslyGay: Peter, temporarily after getting injected with the gay gene.
** Stewie too, as he mentions he had the Straight Camp brochure with him for over a year.
* BrickJoke: Peter sends the horse to Mort after it dies. Mort gives it back to them at the very end.
* BrokenAesop: Peter agreed to take a gene to turn himself gay. The lesson presented in this episode is that you can't change your sexuality. Note the disconnect.
* CampGay: Peter after injected with the gene.
%%* CureYourGays
* DeadBabyComedy: Literally; the disastrous horse race has a woman screaming "My baby's dead!".
* FanService: Lois in that nightie.
* IWantMyBelovedToBeHappy: Lois is depressed without Peter to cuddle, but she gets Peter out of the Straight Camp because he wants him to be happy being who he is with Scott.
%%* GayAesop
* LetUsNeverSpeakOfThisAgain: Literally said by Meg when Peter becomes straight again.
-->'''Meg:''' [[LampshadeHanging So, this is one of those things we just never talk about again?]]
* OutOfCharacterMoment: Brian admits that sending Peter to the straight camp goes against his agenda, but does it to make Lois happy.
* OverlyLongGag: ''"Guiltyyyyyyyyyyyyyyyyyyyyyy."''
* StatusQuoIsGod: The gene wears off at the end.