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...In most species, the ability to engage in sexual behavior is hormone modulated.

In primates and humans, ability is in no way controlled by hormones, but hormones do control (sexual) motivation."The six female macaques were treated with one-week courses of each of the following: estrogen only, estrogen plus natural progesterone, and estrogen plus MPA.Researchers found that adding natural progesterone moderately reduced estrogen's libido-stimulating effect, but adding MPA completely eliminated it.The animals exhibited normal aggression patterns while on estrogen or estrogen plus natural progesterone, but aggression levels increased when they were on the estrogen/MPA combination.

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