The differences between men and women's sexuality are really amazing sometimes, although not really surprising.
Reading the OP where she says that she is sexually attracted to other women but repulsed about going below the waist but in my experience with bi guys, it's been like bix has mentioned, all about the D.
To the OP, yes, I believe sexuality is very fluid. Time of day, day of week, day of month, who knows. And I do agree that we're all bisexual, and only our willingness to act on our curiosities limits our experiences.
I envy women. They have more opportunity for successful companionship than men. The traits that most women seek in men (tenderness, kindness and sensitivity) are usually present in women. Society works against men who too openly sport these traits.
Ultimately, "experimentation is our only means of first hand knowledge. Everything else is poetry, rumor and imagination." Happy experimenting!