Sex when you're in love is incredible. You got all those mushy feelings and are just totally satisfied. But although there is passion, there isn't much risk. Honestly, even if you choke or get rough with a loved one, you tend to feel a little guilty or think to yourself “is this f*cked up?”
Well, sex with someone you hate is REALLY different. You do whatever the f*ck you want, and feel no remorse. Queef? Who cares. Accidentally knee him in the d*ck? Whatever. Choke him till he taps out? Not your problem.
Seriously, sex with your enemy is just the best. You're not self-conscious or nervous, 'cause you know that person.. and you know that person is THE WORST. So you can afford to be a little selfish, 'cause if you don't get called again, you truly DGAF.