Realist, thank you for sharing that perspective.
I had a bisexual boyfriend once. I didn't know it going into the relationship - he shared it with me later. We were both young (about 20 yrs old) at the time. We dated for about a year. Eventually though, we broke up and it WAS largely because of his bisexuality. A former boyfriend kept coming around and pursuing him. In spite of my efforts to put the thought of him with another man out of my head, eventually I began seeing other traits in him that I considered unattractive - and the interfering past boyfriend didn't help matters in the least. Even though he assured me that he wanted only me, I began to feel as if I may not be enough for him over time, simply because I was only a female - something I have no control over. And why deal with that? I mean, I can keep myself attractive, stimulating, and alluring - but I'll always only be a girl.
There was a lot I loved about him as a person, but I'm glad it didn't work out. Now that I am married to a totally heterosexual male, I realize that's the sexual orientation that I MUCH prefer in a mate.