When I was 16 and hitchhiking, I was picked up by a fag who tried to feel me up. I can't say that that was the moment I decided I would be heterosexual. It was all pretty black and white then just as it is now. Methinks even if that little fat pug had used force, it would not have changed my sexuality since only one of us would have lived on have a sex life.
Of course, no one ever encourage us to explore alternate ways in the 60's.