1. Men think more about sex.
The majority of adult men under 60 think about sex at least once a day, reports Laumann. Only about one-quarter of women say they think about it that frequently. As men and women age, each fantasize less, but men still fantasize about twice as often.
In a survey of studies comparing male and female sex drives, Roy Baumeister, a social psychologist at Florida State University, found that men reported more spontaneous sexual arousal and had more frequent and varied fantasies.
2. Men seek sex more avidly.
“Men want sex more often than women at the start of a relationship, in the middle of it, and after many years of it,” Baumeister concludes after reviewing several surveys of men and women. This isn’t just true of heterosexuals, he says; gay men also have sex more often than lesbians at all stages of the relationship. Men also say they want more sex partners in their lifetime, and are more interested in casual sex.