Estrogen regulates the secondary sex traits of body hair growth, breast development, ovulation, and menstruation. ... they separate to accommodate a descending baby during childbirth and the erect male penis during sexual intercourse.
Title | : | Family medical guide |
Author | : | Ira J. Chasnoff, Jeffrey W. Ellis, Zachary S. Fainman |
Publisher | : | - 1983 |
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