It hit me later in life, more around my late 20's to early 30's. I was in my early 30's when I had my first bi experience and I'm not really sure when I first thought I was bi had to be late 20's. It came about from watching straight porn. I've always been a tit man ever since I dont know when, well forever I guess. I watched big tit porn like it was a religion, ok maybe it was, my own god if you will. I realized that I much preferred huge cocks in my porn over avg ones after a short while. Eventually I got to a point where I would almost be as enamored with the cocks as the tits. So like I said around my late 20's I started to question my sexuality, at first I was worried because I was thinking I could be gay or bi. Over time I just had to admit I liked big cocks, and then I had to decide what else I liked. Eventually I arrainged a meeting with a big dick on gay.com. I was not even the least bit nervous or apprehensive. I met him went to his place, he went to the bathroom I got in my underwear and sat on his bed. He came out and was happy to see me like I was. He got down to his underwear sat behind me and started fondling my dick in my underwear. I realized then and there I was bi. I returned the favor for about 30 seconds, then took his underwear off and mother nature took over from there. I guess I was a natural born cock sucker, so I guess I was born bi and just did'nt know it till 30 years later.