Pheromones

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Pheromones are a class of odorous chemical substances produced and emitted by numerous species of animals and, apocryphally, by humans as a means of sexual stimulation.

Pheromones are external secretion that convey a chemical signal among organisms of the same species. Compare to hormones which are internal only to the organism but conveying a chemical signal among organs.

They are a popular device in fiction, including the novel Jitterbug Perfume by Tom Robbins and the film Love Potion Number Nine.