When, if ever, does a bisexual man become gay? Well, as KDaddy23 put it. When he decides that being gay is what works best for him. I've been there a couple of times, and thought about the possibility of coupling with a man and living as gay. The first was my friend who introduced me to gay sex. We had a long and passionate relationship that lasted six years until he passed away suddenly. I started dating my future wife after he and I became involved. I was in love with both of them and did a lot of reading about polyamory. That was the high point of my bisexual life as I had frequent sex with both of them individually. I did consider the possibility of settling down with him. A throuple would have been nice, but that wasn't going to happen. In another instance I had an intense relationship with a man I met while on a work project in the Bay Area. He came to my hotel room once or twice a week for some romance and incredibly passionate sex. Think "Room in Rome" with two men instead. We were both married, and lived on opposite sides of the country, so it was never going to work out. We discussed the "what if" we had met under different circumstances. I absolutely would have married him given the chance and lived as (almost) totally gay.
I really envy all three of you, @Desiplayer, @KDaddy23, and @spankablebob, and how you each found ongoing out of this world sex with another man, and even love for a couple of you, while also having wives that totally understood and accepted you and these relationships. I've yet to experience even a sexual relationship with another man on an ongoing basis, let alone finding love and a boyfriend. But I dream about it many times every single day. And I wonder what my life would've been like if I had found a woman who would not only have not rejected me in general (which *all* have done so), but accepted my strongly needing sex with guys. I feel the three of you really have lived and are living exceptional lives. Well, I just know there's a man (or men) out there for me, because I want to give everything to them--passionate sex and love. I am so tired of casual sex with men.