I'm not bisexual, but... the majority of the women I've dated have been. I had a lesbian friend ask me, "Why do you bark up the bi tree so often?" Well, honestly, it's because - apart from the B-F community - the women who dig me and are amendable to what I like in the bedroom usually happen to swing that way. A lot of self-identified lesbians (again, not in this community, just in general) are not so keen on my cock-centric sexuality. Like many genderqueer, transgendered, and male ID'd butches, I bind, pack, and get read as a guy on a regular basis.
Derailed tangents aside:
"Being able to love and romantically relate only one sex, but have sex with two, to me is not bisexuality. That's heteroflexible or homoflexible. A lot of people are that way."
I agree with that one. In fact, I've said that myself for years.
I had a bisexual ex who told me she felt compelled to make up her mind for years. This caused her to have both a straight phase and a gay phase. She eventually "gave up" and realized she could be happy with either. She had friends who had seen her with both sexes, yet still would say things like, "Oh, so you're straight now" if she dated a man or, "Oh, so you're gay now" if she dated a woman.
When she told her parents, they said, "Oh, honey, it's just a phase. Everyone is bisexual. Everyone! That doesn't mean you're actually that way! Just focus on your attraction to men and you will be fine."
She brought me home and they didn't know
what to think.