In reexamining the "sex war" debates between radical feminists and lesbian feminist sadomasochists, I find that the actual practice of sadomasochism provides the basis for a philosophically more complex position than has been articulated. In response to the anti-SM radical perspective, I develop a distinction between simulation and replication of patriarchal dominant/submissive activities. In light of this important epistemological and ethical distinction, I claim that the radical feminist opposition to SM needs reassessment.