The book Sperm Wars talked about an interesting research about the number of sex partners for men and women. Is is well-known that men report double the amount of sex partners than women. People typically think this can be explained by men bragging i.e. exaggerating their numbers.

Researchers repeated the test by hooking men and women to a lie detector. While tge number of sex partners reported by men dropped a little, the interesting thing was that the number of sex partners reported by women raised a lot. Ultimately they were very close to each other.

I think the social stigma for women is higher for number of partners in general, and that explains the tendency to downplay numbers.