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The real reason is that they love rape and can't be sexually satisfied unless there's some element of rape involved. Covering their insecurity is actually a minor element of it.
A girl will insist she doesn't care about the height of men, but they just so happen to be with a 6"11 Chad for reasons completely outside their control. They secretly recontextualize things like this into the feeling of being raped and controlled by high value men.
You can't rape the willing of course, so it doesn't work as well if they straight up ask to be dominated. They need to convince themselves, and completely believe themselves, that they have less control than they do. A different and isolated part of their brain is meanwhile trying to maintain and expand the control they have in the relationship. Without themselves knowing about it somehow. It's a real mess.
That's how girls are able to come up with false rape accusations so easily and so many years after the fact. They have a sexual experience that isn't sufficiently rapey enough, so they flick their bean to the memory while transforming it into a more satisfactory version of what really happened. It activates the complex that wants to believe they were raped and treated like shit.
Gay guys call it "consenting to not consent" and they can be honest about it without their manipulation empire crumbling.