As a response to the growing threat of childbirth human females evolved away from estrus ie sexual receptivity only when ovulating to the menstrual cycle and continuous sexual receptivity the mysterious moon related cycle led women to formulate the concept of time and make the connection between sex and pregnancy it also allowed them to refuse sex when they were ovulating. Sex time and power how womens sexu ality shaped human evolution by leonard shlain a cursory search on the web reveals the extent of the dam age such whimsy can wreak web sites ranging from why your wife wont have sex with you to a delineation of the brain power of biblical characters in time menses left brain to pro. Sex time and power how womens sexuality shaped human evolution by shlain leonard publication date 2003 topics sexual attraction mate selection human evolution social evolution sex biology evolution biology publisher new york viking. In a time when we are fighting for respect as women and use the slogan thefutureisfemale it manifests the reality that thepastisfemale as well for those who are as interested in the history of the feminine experience through the evolution of humanity sex time and power how womans sexuality shaped human evolution is book number one to dive into. Sex time and power how womens sexuality shaped human evolution by joab jackson by leonard shlain viking clothbound