<human>: I'm a straight female, but I notice that I, and a lot of other straight women, cab behave in ways that seem to straddle the line between sexual orientations.

I mean, straight women check other straight women out, and I don't think it's always a competition thing. Women find other women sexual, beautiful, or exotic just like men. Straight women make out with other straight women, but it somehow doesn't mean that they're gay or have any gay sentiment. And, I know quite a few very heterosexual, God-fearing, in a relationship with a man, women that have admitted to having dreams that involve sexual encounters with other women.  What does it  all mean?  

What does it mean when people separate male and female sexuality? Or sexual orientation?

I can't seem figure out if sexuality is all encompassing and that there are only differences because we created them through norms.  What does it really mean to be gay or straight and is it possible that there is no such thing? Are humans supposed to be sexually attracted to other humans despite sex/gender differences?  In other words, were all humans bisexual where societal and religious boundaries suppressed our desires?

I just really want to know that I'm not only one that's wondered these things before.  I don't science-y answers, but if you're a sociologist who is an expert on human sexuality, I'm all ears!

Can you succinctly summarize the text in 1-3 sentences?
<bot>: Is sexuality meant to be grouped in categories? And, are all men and women meant to be attracted to the both sexes at the same time where we only aren't due to conditioning?