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Sex differences in human sexuality are plentiful and include physical, psychological, and psychophysiological variations (Geary, 1998). Examples include masturbation frequency (Oliver & Hyde, 1993), sex drive (Baumeister et al., 2001), habituation of sexual arousal to sexual stimuli (Laan & Everaerd, 1995a, b; O’Donohue & Geer, 1985), cognition (Geer & Bellard, 1996), self-reported arousal to sexual stimuli (Murnen & Stockton, 1997), and the concordance between genital and self-reported sexual arousal (Laan & Janssen, in press; Chivers et al., 2005), to name just a few. These examples suggest considerable variability between the sexes in various aspects of sexuality. However, most traditional models of sexual response (APA, 1994), sexual dysfunction (Barlow, 1986), and sexual orientation (Bem, 1996) are not sexspecific and, as such, may not adequately explain observed differences in male and female …