Today we talk about a person’s N, the number of sexual partners that one has had in their lifetime. There is some issue as to whether P in V sex is required in order to increment its value, we will assume that it is. Let’s cut right to the chase, men do not want to have a woman for which they are considering commitment to have a large N (preferably zero). There is a built-in revulsion by men to large N women, primarily because it increases the potential of cuckolding. And in the olden times there is little worse than one can do to a man than cuckold him (in modern times one can cuckold and divorce rape him). Women sense this and naturally edge down their N, often not counting such things as BJs, drunken sex, etc. But there are “slut tells”. Women, do not necessarily believe that you can keep it hidden, especially in the long run.
As for men, a somewhat larger N is considered to be ideal from the modern women’s perspective. My Mom would have been abhorred by this, but here is just another example of modern women doing what feels natural to them. The reason that a large N is “good” is because it shows that the man under consideration can attract women, and therefore probably has good seed.
One important point to consider is that women with many pre-marital partners correlates with divorce of the marriage very strongly. This is much less true of men. It would seem that women lose their ability to pair bond well from such activity.
[Spawny – If you’re looking for the numbers, here’s a great start]