Shorter Dana Loesch: you can't be raped if you've previously had sex voluntarily, with someone else.
Ah, 2012. Truly we are in the midst of a second Enlightenment.
Immediate corollaries include, but are not limited to:
1. Rohypnol isn't a date-rape drug if she already uses sleeping pills;
2. It's not sexual assault if you've seen her scratching her own arse;
3. You can't be mugged if you've donated money to charity; 
4. Identity theft only happens to people who don't tell their friends where they live;
5. You can't object to being stabbed if you've had your ears pierced; 
6. It's fair game for a paper to tap your phone if your agent has ever spoken to a journalist on your behalf; 
7. It isn't torture if anyone in the world has voluntarily done something more uncomfortable to themselves; 
8. Dracula's only crime is to not check his victims suck their fingers after getting a paper cut.
The concept of consent: ruining the arguments of proudly sadistic imbeciles since time immemorial.
 I stole this one.
 And this one, from Charlie Pierce.
 This, of course, has actually been argued.
 And this.