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Pheromones play an important role in animals.
They affect the choice of mating partner in hamsters, determine when rat mothers will wean their pups and play a part in dominance relationships among male elephants. Until recently, there was no evidence about how they worked in humans. Two human pheromones have now been isolated which have been shown to help in the regulation of the length of a woman's menstrual cycle and ovulation. A study was performed in 29 women between the ages of 20 and 35 who had regular monthly cycles and ovulated spontaneously. Pheromones were gathered from nine of the women by placing pads under their arm pits during specific phases of their monthly cycles.