So if you're marketing porn to men, it's better to write "slut gets destroyed by huge cock" than e.g. "man has great sex"? I think you're right, but it's pretty disturbing, hearing it put that way.
Usually men have the dominant role during sex whilst women prefer to be submissive (though obviously not always the case). Using hyperbolic language is a safe and effective way to demonstrate dominance.
And it really doesn't matter that destroy isn't meant literally - it's still used as a term intent to degrade and humiliate. It's about male power fantasies.
Women also read romance novels set in Victorian times - are you now going to claim that we'd all like to wear corsets and swoon at the arrival of our heroes?
Also: I don't see guys clamoring to become pizza delivery drivers, either, and yet it's a common porn trope.
Producers have to have some way of making their product grab your attention, and "two people fucking" isn't going to do it.