Intrasexual competition, ie competition with the sexes over reproduction or associated aspects of social life.

Women want to reproduce and of course like attention and being seen as sexually desirable (by the right guys). So that's their concern.

The best layman explanation I have seen was showing various kinds of girls with different bodies, hobbies, and dress. All being called an fitting name. The hot one was a slut, the not hot one was ugly, etc. What the comics then did was pan out and show them calling one another these names to socially check them. And most people who attended public school will have anecdotes of this, whenever I heard some girl disparagingly called a slut it was by girls. Guys would say it in a braggadocious way

And that is what we see with certain things feminists will call Patriarchy or Internalized Misogyny, it is driven by women and intrrasexual competition. Modesty standards are a great example. Men are fine with women being topless as per surveys. It is women who oppose it. Nobody wants the commodity devalued, attention going to more beautiful people, or to be shut out from competing. Just as Unions call temporary workers 'scabs'