S. Brody et C. Breitenstein, The trade-off between frequency of intercourse and sexual partner accumulation may reflect evolutionary adaptations, BEHAV BRAIN, 23(4), 2000, pp. 594
The adaptive trade-offs between long- and short-term matings may be mediate
d or at least reflected partially by the trade-offs between the relative re
inforcement obtained through a greater frequency of inter course (typically
greater among cohabitants) versus a greater frequency of partner change. T
he differing correlates of each approach and meshing with the Sexual Strate
gies Theory of Gangestad & Simpson are discussed.