From an evolutionary point of view, women are supposed to be selective with finding their partner, because getting pregnant with the wrong partner might lead to the extinction of the line.
Now women sleep with 20,50, 100, 200 and even more men, these women have absolutely no idea what they want, and do not know how to select a partner. Avoid them because you'll waste your time, money and energy.
Even those in the low 20's body count, they have a higher chance of leaving you later on.