Reply #6: I suspect the answer is yes, but not because women's sexuality is inherently more fluid...

[Irreverend IX]

The US and many other societies sexualize women in popular culture a lot more than men. There are a good deal of ads and other media with shirtless dudes and cowboys, but sexualized images of women are an order of magnitude more widespread in popular culture than sexualized images of men. These images probably have just as much of an effect on women as on men, and can encourage the expression of latent bisexual tendencies in women who otherwise may not have realized they were capable of same-sex attraction.

Also, females who do "guy things," including sleeping with women, aren't as abhorred as guys who do "girl things." I remember reading about how there are a lot more women in college who are "lesbian until graduation" than guys who are "gay until graduation." Among a lot of young people, it's seen as no big deal and even sexy for a girl to have done some same-sex stuff, but if a guy admits to it his peers will never look at him the same way.