This is just personal musings, call it a hypothesis, but one which I neither have the qualifications, nor the personal situation to pursue and verify.
Much has been made of “gay sex” in the animal kingdom and that does occur. There’s lots of same sex activity, especially among us mammals! Over 1500 species have been identified as engaging in same sex activities.
But I raise the question is this really gay sex? Or, as my hypothesis states, are mammals naturally bisexual?
I ask this question because the lions that engage in same sex activities will immediately turn to heterosexual activities if one of those males ascends to leadership of the pride. And the former pride lead, will move to same sex activities after having been engaged in heterosexual activities as well.
What’s going on? I think we’re seeing evidence that animals and especially mammals tend to be bisexual.
I further examine history and non Judeo-Christian-Muslim cultures, and I see a lot of reference to “gay sex” again in cultures like ancient Greece. But was it gay sex exclusively? Or was there a lot of bisexual activity going on? Many of those men famous for having male lovers, also had wives and children and appeared to love and cherish their wives too. Again, this, to me, hints that homo sapiens is naturally bisexual.
So why the heavy emphasis on heterosexuality and homosexuality in Western culture? Because our culture is wrapped around a religious myth about gender binaries and a religion that is often interpreted to look down with disdain towards anything related to non-heterosexual relationships.
I really suspect the “stomping out” of our naturally bisexual tendencies comes from Judeo-Christian-Muslim cultural sources.
I’m not denying that some people will be way over on the homosexual side of the spectrum and that some people will be way over on the heterosexual side of the spectrum. But I really suspect cultural conditioning forces most of us to choose one side or the other, when many of us might really be happy somewhere in that center. And guess what? That would probably look like a more normal bell curve too… hmm… things to think about, right?
As I said, this is simply a personal hypothesis based on reading about heterosexual and homosexual behavior in other species, coupled with reading about both kinds of behavior in non-Judeo-Christian-Muslim cultures historically.
So what is my point? If you think you might be bisexual, my reply would be that I’d tell you to explore it, because that really does, to me, appear to be the normal human default sexual orientation. 🙂
Liz - Day By Day 
I don’t think of myself as bisexual but as ambisexual in the sense that an ambidextrous person can use either hand equally well depending on the circumstances and neither hand is the dominant one. For me my sexual interests would also depend on the circumstances. Both terms suggest the gender binary but I’m not limited to that way of thinking about the very diverse gender spectrum which I taught myself during my transition.
Those are good points. I think the point I was trying to make was that we human beings, as a species, are a lot more sexually diverse than people want to believe, just like a lot of other mammalian species have shown.