I know there are people in fandom who aren't, and even people in fandom who aren't feminist or even identify as anti-feminism, and presumably there are even non-pro-sex (not in the asexual sense, in the sex-negative sense) people in fandom, but my expectation is the same as damned_colonial's.

Just like Pretty Princess Monsters Blargh fandom is positively riddled with guys, but I still assume people are women unless there's an indication to the contrary.