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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.