Our happy hour fact to amaze your drinking buddies with.

A new study suggests that, for many women, sexual desire follows intercourse, rather than precedes it.

Researchers have always been baffled by the number of otherwise healthy females reporting little or no libido. But after interviews with hundreds of women, Canadian psychiatrist Rosemary Basson has come to the conclusion that "women often begin sexual experiences feeling sexually neutral. But as things heat up, so do they, and they eventually experience desire."

Her theory would explain why libido-boasting products for females -- which tend to increase blood flow to the genitals like Viagra does for men -- have little effect.

It could also provide an optimistic rejoinder -- and eventual end -- to the longstanding tyranny of the "I'm not in the mood" excuse.

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