I've questioned my sexuality for the last five years or so... since I was about 22, and went to live in Iceland for a year and discovered how diverse people's sexualities were. (I was an evangelical Christian from age 14 to 22-ish, so I had pretty much cauterized my sexuality up until that point.) I started wondering about mine... freaked me out a bit at first, how I thought about women (similiar to what you describe). But, I tried to just let it be what it was.
Since I started having sex at age 24, with a guy (none with women before, though), I can say that I am certainly more towards the heterosexual side of the bi-scale. But not 100%. And I'm fine with that. I like getting off watching lesbian porn, about as much as I get off watching XXX hetero. I don't know if I'll ever play around with a woman, since it's not something that my partner and I are comfortable with at this point. And I won't do anything that he wouldn't be comfortable with, sexually. But, the desire is there, and it's just a part of me. I wouldn't call myself formally bi, but I'm not afraid of that label, either.
Because a label is just that... an easy way to categorize yourself and others. You are who you are. A complex person, with many facets. Stick to that, and you'll be okay.
