Votergasm.org, an exceedingly-well-designed site for what it is. And amusing.

Votergasm is a non-partisan nonprofit campaign formed to simultaneously reverse two disturbing trends in American society: low voting rates among young people, and unacceptably low rates of youth sexual activity. The focus of Votergasm.org is to encourage young people everywhere to pledge to have sex with voters on Election Night, and withhold sex from non-voters until the next presidential election.