I am convinced that steroids do lead to an increase in sexual experimentation.
When I dabbled in gear my sex drive was INSANE. Now I didn't try anything gay during this time frame, but I was insatiable. At first my then girlfriend thought it was great, but after a while, she grew weary of my always wanting sex, and it created some problems in the relationship.
I'm sure that while some people are super horny, some sexual acts/ideas would sound far more appealing, then they would normally. I think that this helps to explain some of the G4P...it is probably just easier to deal with that kind of b.s. when you are that amped up, and in need of validation.