I've been bicurious since I was a teenager. However, I live in the Bible Belt and have plenty of relatives I call "Jesus Freaks", aka overly religous. So I never did anything to satiate that curiosity. Farthest I've gone is sharing pics. I've been with my wife for about 12 years, married for over two. And she'd freak if she knew I was bicurious, possibly bisexual. (Plus, I want anal sex more than cocksucking. I want to be bent over the side of the bed and pounded full of cock. I've jacked off to that fantasy quite a lott.)
My realization began several years ago: I was showering after a lunchtime pick-up basketball game, preparing to return to my office. In the shower there was a guy, well-tanned, a little shorter than me. He was turned away from me, and appeared to be washing his cock and balls. We were the only two in the shower area at the time. Well... he turned toward me, and showed me the most beautiful cock, initially cupped in his hands, then he began stroking it gently with his eyes on me. I was mesmerized with instant attraction and desire. I realized at that moment, tremulous, that I wanted to do everything I possibly could with that cock. I demonstrated my interest in him by stroking mine. This erotic session was ended when others entered the shower area. I have fantasized about that guy and his anatomy ever since.
Started I guess real early while playing doctor with childhood friend for about a year. We would penetrate and sit there. Lol went about life not thinking about it much till early twenties when I got married and wife told me during sex she would masturbate thinking about me sucking he ex's cock. Was actually good friend of ours. We were swingers but never played with guys able to get over the label of a guy sucking them. Through the years I was always turned one by cocks. Finally after divorcing I found out through dating how many women are turned on by bi guys. So when my current wife and I met and she told me she watched guy and trans porn I told her I wanted to try it. She arranged it and I been addicted since.