If ABC’s Cougar Town makes a case for older women banging younger guys, then its Eastwick makes a valid argument for older horny devils. Adapting The Witches of Eastwick, with its memorable performances from stars Susan Sarandon, Michelle Pfeiffer, Cher and, especially, Jack Nicholson, was a risky enterprise. But Eastwick turns out to be a surprisingly fun and sexy entry in the new fall season: Desperate Housewives without the heavy-handed satire and mom angst.