To me, feminism is about questioning gender roles. Why do we suppose that men ought to behave in one way and women in another?
Here are some links to various places on this site where the feminist theme became more explicit than elsewhere, not that my whole site is not feminist.
Meanings of menstruation
written for Bi Community News, following a workshop of the same name at BiCon '96
BDSM: A feminist perspective
written for Outright as part of a double-page feature on BDSM generally
A short ramble around Western culture's body size obsession