Why are men so concerned about what girls do with their vaginas?

I've seen men, especially on this site, slut-shaming women who happen to have a few sexual partners. Some of you guys come across as self-entitled and controlling, declaring the amount of sexual partners is "acceptable" for a girl to have. Why are you so concerned with their bodies and what they do with them? Sorry it actually makes me angry.
Why are men so concerned about what girls do with their vaginas?
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