RHYTHMIC CHANGES IN THE COPULATORY FREQUENCY OF RHESUS MONKEYS (MACACA MULATTA) IN RELATION TO THE MENSTRUAL CYCLE AND A COMPARISON WITH THE HUMAN CYCLE

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Abstract
Summary. The frequency of ejaculation in thirty-two pairs of rhesus monkeys studied during seventy-five menstrual cycles was significantly higher (P<0·001) in the follicular than in the luteal phase of the cycle: this pattern was closely similar to the changes in the incidence of sexual intercourse reported in a human population.

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