Fifty-four percent of men compared to 19 percent of women think about sex every day or several times a day. In our research of couples’ sex lives, we found that, ideally, men want sex four or five times a week, and women one or two times. Men have more explicit sexual fantasies and women have more romantic fantasies. Adolescent males masturbate more than adolescent females, and that trend continues into adulthood. Men in general are more receptive to sex than women are. Generally, we can conclude that the bottom line is that men have fewer prerequisites for sex than women do.