I went to a conservative boys catholic school, but I am straight and I have no sisters who might have helped make introductions. I almost didn't even have a conversation with a girl in my teenage years, I didn't kiss anyone or loose my virginity until I was 21, both things happened on the same day.
I often listen to peoples tales of teenage sexploits with much regret, and find it ironic that most people tell them regretfully!
Reminds me of an add (an add for what I can't remember) that used to be on UK tv, the camera zooms in on an old guy in a wheelchair and a caption introduces him as a former poet laurate or nobel prize winner and then the voice of a narrator asks him if he has any regrets from his long life and the old guy replies "yes I wish I had more sex"
Ah well no more sex for me now I guess, I'm married