Conservatives have huge issues with consent. Remember this Rush Limbaugh quote?

You can do anything, the left will promote and understand and tolerate anything, as long as there is one element. Do you know what it is? Consent. If there is consent on both or all three or all four, however many are involved in the sex act, it’s perfectly fine, whatever it is. But if the left ever senses and smells that there’s no consent in part of the equation then here come the rape police. But consent is the magic key to the left.

They understand the concept of consent, but it offends their patriarchal values so they loathe that it is seen as a virtue (and indeed, a moral necessity for sexual acts) by people who aren’t tuned-up right-wing freaks.