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There has been a successful trial of an aerosol testosterone spray for women with low sex-drives. It does, in fact, make some substantial fraction of its users horny. The side-effect is that it increases hair growth.
The spray delivers testosterone and a substance to ensure the hormone is held in the skin and absorbed over 24 hours - similar to the way sunscreen remains on the skin.Link
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.