Well I guess it was when I was 15 and I pleasured the dog using my lips and mouth. Though, at the time I didn't know bestiality was illegal. Boy was my face red!
I was 6. I had a neighbor who had me come over every day so that I could give him blowjobs. He was 12. Let's call him N. By age 10, it had moved to friend with the baby penis. Let's call him J. Once, I gave them both head on the trampoline. I could deepthroat two cocks at once by age 11, and had started playing truth or dare with 3-4 of their friends. They had me drink their cum, and shove large pieces of broken concrete in my asshole. (There's also some other funny stories at a T/D game where they had me get hard and then streak out tho the trampoline and do a belly flop, stab myself in the balls with a saw palmetto, and fuck his cat.) When I turned 12, I got a promotion. He invited his 4 friends over plus a 22 year old when his parents weren't home (they were never home) and I was penetrated in every single hole for about 3-4 hours until all of them came.
In my later months when I was 12, I joined the Boy Scouts with N. He had me tent with him every campout and it seemed like every meeting he would have me go behind the quartermaster shed to get fucked and then suck him off. When he got Eagle Rank and went off to college, that's when my real lovey gay experiences happened. To this day, I consider everything that happened before this point "brainwashing and rape", even though at the time it seemed like I enjoyed it. Hit a reply if you want to know my other gay experiences.
BTW: I'm a 19yo M Wht. Twink. Pansexual. With BF and GF.