PSY 3391 Lecture Notes - Lecture 12: Corpus Luteum, Follicular Phase, Frank A. Beach
29 Oct 2017
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About every 30 days but species speci c (28-32 days in humans, 29 days in orangutans, 30 days in gorillas and 37 days in chimpanzees) Duration of estrus persists for 4-6 days in orangutans, 2-3 days in gorillas and 10-14 days in chimpanzees. Female becomes more assertive while males are more passive during solicitation. Follicular phase (follicles in the ovary are maturing and begin to secrete estrogen) Midcycle phase (estrogen levels are maximal and ovulation occurs) The luteal phase (when progesterone is secreted by the corpus luteum) Some primates limit their sexual activity to the time of estrus, like marmosets. Other female primates, like rhesus monkeys, bonobos, and humans, do not limit sexual activity to a particular time. In the 1970s, animal researchers believed that females were more passive recipients of male sexual attention. In 1976, frank beach noted that female mammals initiate sexual activity.
