Part of the reason I classify myself as "BI" is due to my early experimentation as a teenager and young man. The very first sexual experience I had involved a next door neighbor. I was 13 and as innocent as they come. I had never masturbated even. I didn't know what semen was. We camped out one night during the summer in a pup tent. It got hot as hades and the next thing you know we were stripped. Just the nakedness there together led to some screaming erections (which I didn't understand either). He soon reached over and began feeling me up, then began stroking my young cock. It started feeling better and better and I had no clue what was going on. Eventually, I blew my cookies all over the place and I may as well have been in outer space because I was disoriented as can be. I remember having cum all over my chest and felt dirty. It was a fantastic orgasm, maybe the best I have ever had. Later that summer, he taught me how to masturbate and we did it together several times. Sometimes we would put on his mother's underwear and pretend to rape one another. We never sucked each other and looking back on it I am surprised he didn't suck me; I probably would have reciprocated if he had. I think that first sexual experience made me inclined to be willing to be with other men. It was later at 15 that I first had sex with a girl. I was wondering if others seem to be influenced by their first experience as I was?