http://therationalmale.com/2014/12/17/estrus/

Initiating sex or being receptive to a primary partner’s sexual interest during the luteal phase (the Beta swing of the cycle) follows when we consider that a woman being sexual during this phase poses the least potential of becoming pregnant while simultaneously (rewarding) reinforcing that primary partner’s continued investment in the pairing with sex (intermittent reinforcement). This is a very important dynamic because it mirrors a larger theme in women’s socio-sexual pluralism – it’s Alpha Fucks/Beta Bucks on a biological scale.

Compare this intra-relationship predisposition for Beta sex and contrast it with the larger dynamic of open Hypergamy Alpha Fucks during a woman’s prime fertility window in her peak SMV years, and her post Epiphany Phase necessity to retain a comforting (but decidedly less sexually exciting) Beta provider.

Women’s sexual strategy on a social scale, mirrors her instinctual, estrous sexual strategy on an individual scale.