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Sexual deprivation and its influence on testosterone levels and sexual behavior of old and middle aged rhesus macaca mulatta males



Sexual deprivation and its influence on testosterone levels and sexual behavior of old and middle aged rhesus macaca mulatta males



Biology of Reproduction 31(3): 480-486



After approximately 6 mo. without access to a receptive female, 8 old (19-25 yr) and 8 middle-aged (9-15 yr) males were given 9 daily 10-min tests of sexual behavior with receptive females. Three ovariectomized, estrogen-primed females served as partners. Blood samples were taken from the males at 0900 and 2100 h on 2 consecutive days before and after the series of 9 behavioral tests. Serum levels of testosterone (T) were measured by means of radioimmunoassay. There were no significant differences between serum T levels after 6 mo. of sexual deprivation and after the 9 tests of sexual behavior, nor did serum T levels differ between middle-aged and old males. Serum T levels were significantly higher in the 2100-h samples than in the 0900-h samples for both groups. The nocturnal increases in serum T, both absolute amounts and percentages of increase, did not differ between middle-aged and old males. Repeated daily testing had little effect on the major components of male sexual behavior. Middle-aged males outperformed old males; middle-aged males had higher rates of contracting the female, mounting and intromitting. They ejaculated earlier and had a greater percentage of tests with ejaculations than did old males.

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Accession: 006408212

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