It's my belief that if you're seriously into BDSM, that trumps the hetero-homo orientation. You're turned on by submissives, gender comes next.

I've known plenty of men who wanted to be dominated by a woman, but since one wasn't available (good Dommes being notoriously scarce), they'd settle for me. Mostly they swore they were straight, and I believed them: they were turned on by dominants, gender was secondary.

Not that it matters that much. As other posters have said, what's bad about being a lesbian? SOme of my best play partners have been lesbians.