Looking at the evolution of female genitals, the researchers found additional evidence that orgasm once played a fundamental role in reproduction. "Virtually every brain system is activated during women's orgasms he said. As first demonstrated in the 1920s, female rats who mate with a vasectomized male rat will develop a false pregnancy that still includes a change in hormones and even the development of a placenta.
As females moved away from reflex ovulation toward spontaneous ovulation, the clitoris - the major source of orgasm - moved away from the location of sexual intercourse, the vagina. Undoubtedly, Pavlicev and Wagner's theory will only add to discussions and disagreements.