Humans are remarkable in many ways. Most of us, for example, have sex in private. Compare that to most other mammals, who will copulate in clear view of their fellows.

Female mammals usually have a well-defined period of time when they are sexually active. In most primates, at ovulation, the skin around the vagina swells and changes color, and the animal’s odor and behavior change. Sex occurs during this estrus period and may be prolific (female baboons copulate about 100 times with many different males).

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