In Spike Lee's new movie Chiraq (modeled on the ancient Greek comedy Lysistrata), women withhold sex as a way to force their men to put down their guns and stop the violence that has ravaged the South Side of Chicago in recent years. 

Here's a poster that Lee posted that kind of sums it up with the movie's tagline:

Last night on Late Show With Stephen Colbert the director said he thinks that "sex strikes" could become a real thing that people use to create social change, especially on college campuses where he said sexual harassment and date rapes are "abundant."

Via Slate:

“Second semester it’s going to happen. Once people come back from Christmas, there’s going to be sex strikes at universities and college campuses across this country. I believe it," Lee told Stephen Colbert.

It's not really clear how withholding sex from people would be effective as a way to combat date rape, because, well, it's rape, but the idea of sex strikes in general is definitely provocative. 

If you haven't seen the trailer for Chiraq yet, here's a refresher.