You don't get it. She says that if you go that far with someone that will fuck you no matter what, you can't say no. It just won't work and there's not much you can do other than physically push the other person away (which in most cases won't work for obvious physical reasons). Not all men can switch their primal instincts to procreate off at will. You have to have the mental fortitude as a woman to decide whether you'll go that far before you actually do. It is exactly why she's saying drinking equivalently with men is not about "equal rights" it's about avoiding stupid situations where a "no, i've changed my mind" won't make everything go away. Let's face it, when you add alcohol to the equation, all reasons get thrown out the window.