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Have you considered the Baboon?
Color and size of the sexual skin track the estrous cycle. During the 7 day prelude to estrus (proestrus), sexual skin is black with a pink tinge and beginning to inflate. Estrus stage of c. 10 days follows, when sexual skin is fully swollen and bright pink. In 2 to 3 days after ovulating, deflation begins and within 7 days sexual skin becomes flat and black again, remaining in this stage (anestrus) for 9 days, during which menstruation occurs, usually invisibly. Then the estrous cycle begins anew.
I doubt your are going to find any humans with giant inflated pink asses at the club.
I could be wrong.
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