It’s not surprising to me at all. I think it’s far less taboo for women to be bisexual than it is for men. Women are all about having options so why should they limit themselves to only half the population?
It may be far less taboo for women to be bi in your world but as a woman, it grosses me out. My husband always says, two homo guys, ewww, two girls going at it, not so ewww. For me, the female thing is ickier. Same sex is just icky all around.