Surprisingly, the people I’ve known who’ve had the most trouble with the notion of bisexuality are the gay people. That’s not to say that I don’t know straights who have the same problem, it just seems more prevalent. Of course, this is just my personal observation of my own friends and acquaintances and not based on any actual data, so I wouldn’t presume to suggest that this is true for everyone.

I think that what bothers the people I know is that notion of “choosing” or “not being serious”. I personally don’t have a problem with someone being attracted to individuals of either gender.