Sweet... Just DIVE IN (ugh... that was brutal)
Women being bi-curious makes total sense. Who WOULDNT want to please a hot sexy woman!
I suspect that if science can ever isolate the series of genetic cues that define sexuality, they will likely determine that whatever process leads to same sex attraction can sometimes not "fully complete" (pure theory here) and leave someone with the potential for confusion.
I also wouldnt be surprised if it came out that, for whatever chemical reason, this was more likely to occur in females.