"We're conservative right up until the moment that it costs us"

It’s been a melancholy summer for social conservatives. Their movement is fighting a rearguard battle in Barack Obama’s Washington. A cluster of family-values politicians — some of whom bunked down in the same Christian-sponsored D.C. townhouse — have spent the last few months confessing to extramarital affairs. And Sarah Palin ... well, you know how that’s turned out so far.

Worst of all, nobody likes Judd Apatow’s new movie.

Don’t laugh. No contemporary figure has done more than Apatow, the 41-year-old auteur of gross-out comedies, to rebrand social conservatism for a younger generation that associates it primarily with priggishness and puritanism. No recent movie has made the case for abortion look as self-evidently awful as “Knocked Up,” Apatow’s 2007 keep-the-baby farce. No movie has made saving — and saving, and saving — your virginity seem as enviable as “The 40-Year Old Virgin,” whose closing segue into connubial bliss played like an infomercial for True Love Waits.

“We make extremely right-wing movies with extremely filthy dialogue,” Seth Rogen, Apatow’s favorite leading man, told an interviewer during the promotional blitz for “Knocked Up.” He was half-joking, of course, and it’s safe to say that you won’t see Apatow and his merry men at the next Christian Coalition fundraiser. But the one-liner got something important right. By marrying raunch and moralism, Apatow’s movies have done the near impossible: They’ve made an effectively conservative message about relationships and reproduction seem relatable, funny, down-to-earth and even sexy.