What kind of things did you think where the sexual norm when you started out, but later realised where what others consider taboo. For example... are you someone who swallowed, had anal sex or deepthroated with no second thought, thinking everybody did it.. later to realise that it is something other people refuse to do.
My best bud and I would watch his dads porno movies and we would jerk off together. We didn't do anything to each other, but we did watch each other doing it and shooting off. We thought that it was normal for guys to jerk off together.
Thats an interesting one, I didn't even think about that but it certainly sounds plausable that there would be many people in a similar situation to yourself.
Well this may sound weird but a boyfriend used to have in high school used to have me come over his house and lie on his bed naked then he and his friend would both look at me and get themselves off while looking at me. Thought it was a little strange at the time.