Well, I'm a lesbian, and most of the girls I've dated were bi or...uh, straight. I feel bad for bisexuals because they're not fully embraced in the gay community or straight community. I genuinely think bisexuality and pansexuality are very real, but even I am a bit wary of dating a bi girl because I feel threatened by not being able to offer them the social comfort that comes with being in a heterosexual relationship. I also vowed never to date another straight girl again, haha. Anyway, I was talking to my ex who was bi recently, and I asked her if she would ever date a girl again, and she said no because she wanted to have her own children. But when I asked if she was still attracted to women, she said yes. And the girls I dated who were straight also say they wouldn't date another girl again, but then again, they were straight, and I was their exception (not tooting my own horn here, just repeating what they said to me, hehe).
Honestly, if I were bi, I'd probably want to be in a heterosexual relationship. But alas, I am not.