Both gender and science fiction are rather vexed terms: each is marked by rancorous debate over what it means, how it came to mean what it seems to mean today, what is allowed to count as part of it, how it ought to be studied - and who gets to speak to these issues. In his study of 'Critical Terms for Science Fiction and Fantasy', Gary K. Wolfe lists thirty-three definitions for science fiction, many of them directly contradictory. Some, for instance, consider it a subset of fantasy, while others see fantasy as a branch of science fiction. Definitions of gender are equally controversial. Is it a grammatical term, a synonym for sexual differentiation, a class system, or, as Kate Bornstein has suggested only half facetiously, a cult?