You've got the wrong metric. The reason some men have lots of sexual partners is because many men want lots of sexual partners, and some have the ability to do

You've got the wrong metric. The reason some men have lots of sexual partners is because many men want lots of sexual partners, and some have the ability to do so. On the other hand, most women of even mediocre attractiveness can have lots of sexual partners, but fewer of them want to. This is just as you would expect based on the relative energy investment men and women make in producing offspring. Other animals with similar asymmetries in energy investment have similar sexual behavior to humans. Incidentally, this observation puts the lie to the idea that having a stud/slut dichotomy is a "double standard". Having different standards for men and women makes sense; being a stud is hard, while being a slut is easy. Indeed, the vast majority of whining about "gender double standards" can be rebutted with the simple observation that men and women are different.