Not Straight and Not Straightforward: the Relationships Between Sexual Orientation, Sociosexuality, and Dark Triad Traits in Women

Two studies examined the connection between women’s sexual orientation, their sociosexuality (i.e. willingness, attitudes, and desires associated with uncommitted sexual behaviour), and Dark Triad traits (Machiavellianism, narcissism, and psychopathy). Both studies found that moderately bisexual women reported less-restricted sociosexuality, as well as higher levels of Dark Triad traits––particularly psychopathy. In both studies, sexual orientation differences in Dark Triad traits were mediated by sociosexuality. Study 2 confirmed that the relationship between women’s sexual orientation and sociosexuality is curvilinear, with moderately bisexual women (i.e. Kinsey 1–2) reporting heightened sociosexuality compared to other groups. These results are consistent with the conclusion that moderate levels of female bisexuality may be a by-product of selection for traits that result in less restricted sociosexuality. At either end of the orientation continuum, women who report exclusive or near-exclusive homosexuality or heterosexuality report more restricted sociosexuality and lower Dark Triad scores, compared to women nearer to the middle of the continuum. As such, the aetiology of moderate bisexuality in women may be distinct from the aetiology of exclusive or near-exclusive homosexuality in women. © 2017, Springer International Publishing.