Can someone please tell me what ep is this picture from..

I belive it's Family Gay where Peter turns gay by a surume.

I agree!

Family Gay. Peter races that horse but the horse is retarded so it breaks a lot of things. So then Peter to make cash goes in for testing drugs. He gets the gay gene into him.

this is the one where peter gets the retarded horse, and then he goes to the doctor and gets the gay gene...haha i laughed so hard when i saw this one..i fell off my bed..

i have no idea