“…Regarding males, the research may be summarized as follows: - Studies of nonhuman primates have shown that, although a minority of castrated male animals remain sexually active (albeit nearly always at reduced levels), most exhibit dramatic declines in sexual activities following removal of the testes (Loy, 1971, p. 9; Phoenix, 1973; Wilson, Plant, & Michael, 1972; Wilson & Vessey, 1968). Similar observations have come from studying numerous other mammalian species (Young, 1961) and from studying humans as well (Appelt & Strauss, 1988; Ford & Beach, 1951; Wille & Beier, 1989). Because the testes are the primary organ involved in testosterone production (the adrenals and ovaries produce fairly small quantities), it is reasonable to believe that testosterone is involved in sexual motivation.
- Recent research among teenage boys has shown that testosterone levels in the blood are significantly positively correlated with sexual motivation and with sexual behavior to a significant degree (Udry & Billy, 1987; Udry, Billy, Morris, Groff, & Raj, 1985).
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