Twenty males participated in a 2-month study examining the relationship between 8 a.m. plasma testosterone levels and orgasmic frequency. Within subjects, higher levels of testosterone are associated with periods of sexual activity. Over subjects, however, the direction of the relationship is reversed. Mean testoster-one levels were higher for sexually less active individuals.

Higher levels of testosterone are associated with periods of sexual activity, but over time, this relationship reverses, with testosterone levels being higher in sexually less active individuals.

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Orgasmic frequency and plasma testosterone levels in normal human males

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