Women are much more likely then men to identify as gay when asked... as well as bisexual.
Why?
Culture is still mostly male constructed and dominated... and when it comes to men... much fewer men are against women doing it with each other then men.
So your less likely to be harassed (though it does happen, don't get me wrong.)
I mean... for a test of what I mean...
imagine being at a party.
What would happen if two girls you didn't know started making out. How do you think the crowd would react?
Now what happens if two guys were to start making out.
As such, a s woman your less likely to hide, or repress your sexuality.