Legitimate rape. It's become quite a phenomenon of late, and is potentially a great form of birth control, as imagined in this hilarious viral ad ridiculing the recent comments of Republican Congressman and U.S. Senate candidate Todd Akin.
Basically, if you're suffering from Sexually Liberated Uterine Tendencies (SLUT), there's a treatment that can satisfy your carnal urges AND help you not get pregnant.
It's like regular birth control, only imagined by crazy people.
DISCLAIMER: Remember, legitimate rape isn't for everyone. To learn more information and find out if it's right for you, ask your doctor Congressman.