Wow, I kind of feel bad for RonW because of some of these answers. I am not bisexual, so I do not speak from personal experience. However, I don't get the suspiciousness with which bisexual people are received among both straight and gay people. People who are bisexual are not oversexed, sexual lunatics. Some may be but that could be true for some people of any sexual orientation. Being bisexual is about an attraction to both sexes, and there are degrees of bisexuality. I think of it more in terms of bisexualities in the plural, as there are many types and ways of being bi.
People who are bi can be monogamous. Just like anyone, bisexual people can fall in love and be with the one they love. Straight people and gay people and bi people all find other people other than their partners attractive. But to be dedicated to someone in a monogamous way, that has nothing to do with sexual orientation.
The things people brought up in this thread about all kinds of topics from AIDS to monogamy to selfishenss to dishonesty. Wow, there were just so many assumptions on this thread. I'm suprised a bit by the level of bias and prejudice.
For me, I would care much more about the "loyalty factor" that jgnat wrote about. Whether or not they were bi wouldn't be an issue for me.