@cailyn10289 Said
If the person is really into you then there would be no need to compare.
I think that Cailyn makes a really valuable point here.
I am straight and have never dated a bisexual guy. I have a personal preference for very heterosexual men because that's just what melts my butter - I like my men to really love women.
If I did date a bisexual guy who had slept with lots of men and women, and decided I was the one, well, it would be follish to walk away from that if I felt the same. That kind of commitment is hard to find anywhere, no matter what your sexual leanings.
I think it's when you date someone who is uncertain about their sexuality that huge problems start - and I'm sure many people consider bisexuals to be uncertain. Some bi guys and girls feel that attraction but have never acted on it. Some reveal to their partners during the relationship that they think they may be bi.
Fair enough, but it's the uncertainty that does put a question mark over the long term success of the relationship in my opinion. If your partner isn't sure which gender they want to sleep with, it's very much like a straight guy telling his girl-friend he's not sure she's the one. Either way, love is hard enough. People fall in and out of love for bizarre reasons. Being unsure about which gender you want to sleep with is a complicated enough reason to stop a relationship from working out long-term.
I also think that most people succeed in relationships where they have a lot in common - not interests, but attitudes. If one partner is straight, the other bi, they already have a big difference in sexual attitudes and for some couples, I think it's enough to spell the death knell. For others who can get past it and make it work that's wonderful.