Obviously women slut shame more but i'm trying to understand why some guys here slut shame.

A post from askmen about some dude not wanting his sister sleeping around hit the front page and after reading the title, I found myself agreeing with the answers from the original thread.

If the dudes sister wants to fuck as many people, then what's wrong with that?

Learning how the engage in casual sex and plate spinning is probably why a good number of us are here and shaming these women who also do the same seems counter-productive to me.

Why are some men shaming women for wanting to engage in casual sex? It seems like a very possessive attitude, something very apptly described as beta.

What's wrong if she lets you hit it easy? I'm pretty young and just trying to get my notch count as high as possible so the quicker the better.

So my question remains, why the hell do some guys slut shame?