bisexuality seems to me to be some sort of evolvement along spiritual lines. Then again it just might be the fact that I was able to come to terms with it in my conservative family of origin. My brother's wife has a sister who has never had a boyfriend, looks and dresses very masculine and has had a "friend" who dresses and looks like her for her entire life, (they don't live together though) but she tells people she is straight and that God made marriage for one man and one woman.
My parents became quite open about these things but my brother's family are still stuck up with poles in their asses. And I feel sorry for this woman because her family is sooooo evangelical Christian and soooooo homophobic that she has been hidden her entire life. When I just mentioned something to my SIL about her sister being gay, (after we met several years ago and after my mom and I just said, "Oh I didn't know so and so was gay" she had a freaking fit! I was just making conversation! She was mad that I would say such a thing about her sister! (oh she knew about me the whole time she was saying how offended she was that I suggested her sister was gay)
That being said it is interesting to think I may have eaten a twin in the womb!