Women's dual sexuality theory suggests motivation for intercourse varies cyclically, with higher motivation during fertile periods.

“There's something called women's dual sexuality >> and it basically talks about women's motivation to participate in intercourse being different at different parts of the cycle. Meaning midcycle when you are able to get pregnant, you are fertile. You are more likely to participate or to want to participate in intercourse for purposes of reproduction. And the mates that you are more likely to select during that time will have features of genetic dominance such as a very symmetric face, more masculine features. We talk about the hystocompatibility complex and there's dissimilarity that we look for at this time because”