Plasma Testosterone Levels in the Male Rhesus: Influences of Sexual and Social Stimuli

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Science  10 Nov 1972:
Vol. 178, Issue 4061, pp. 643-645
DOI: 10.1126/science.178.4061.643


Four adult male rhesus monkeys were provided access individually to a group of receptive females. Each male assumed dominance and engaged in frequent copulations. Plasma testosterone levels increased two- to threefold during this period. Next, each male was subjected to sudden and decisive defeat by a large all-male group, and plasma testosterone fell following this experience. Two males were later reintroduced to the females, and plasma testosterone rose rapidly to the previous elevated levels.