Why can't women make up their mind...?

It's almost the fashionable thing for women to be bisexual these days. I think they're all (or at least most of them) really straight but playing up the bisexual angle for the media. It's apparently working to get them attention. Men don't really get extra attention for being either bisexual or gay beyond getting a lot of attention for the initial "coming out," so there doesn't seem to be a real incentive for them to play it up.