The Kinsey Scale stretches from 0 to 6; with 0 being completely 100% heterosexual, 3 being completely 50-50 bisexual, and 6 being completely 100% homosexual.
I'd say I'm about a 0.25. I am strongly attracted to men, but the thought of being with a woman doesn't gross me out SO much that it sends me absolutely heaving.
Avatar - Isaac, my blue-fronted Amazon parrot. Adopted 9/7/07. Age 30 (my pet is older than me!)