Testosterone levels determine how much you fantasize about sex

Sexual fantasies in developing teenage boys are also linked torises in testosterone levels (Udry, Billy, Morris, Groff, and Raj, 1985).

Studies of girls between the ages of 13 and 16 found similar results;that is, levels of androgen (of which testosterone is the most prominent hormone) predicted how much the girls fantasized about sex (Udryet al., 1985).

Injecting testosterone into men who have malfunctioning testes leads them to increase their sexual fantasies, and stopping the injections leads to a drop in fantasy (Bancroft, 1984).

Likewise, injections of testosterone increase sexual desire and fantasy in women (Sherwin, Gelfand, and Brender,1985).

Source: Introduction to Social Psychology

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