I'm bisexual, and I've always been baffled by people who are exclusively attracted to one gender. Why does what is between someone's legs matter so much? Why, if someone with the perfect personality, combatibility, etc. came along, would you reject him/her based on whether or not they have a penis? We are capable of forming deep emotional bonds with people of either gender. Sex can be good with a member of either sex, and an orgasm is an orgasm! It doesn't matter who gave it to you...

But at the same time, my attractions to men and women are not symmetrical. Almost all of my serious attractions have been towards women. I thought that that was because all of my friends were female, so I only really got to know women. But now, I have some guy friends, and I still am more attracted to females. My guy friends are amazing-intelligent, passionate, just as emotional as my female friends. One of them isn't bad looking. But when I think of a relationship with him, my thoughts immediately go towards the pride of bring a man home to my parents and having biological children. I don't get excited just by the prospect of being with him, like I do around the women I'm attracted to.

Why is this? Why are we more attracted to one sex over the other?