‘Guilty as Sin’

If recreational sex these days is a battlefield, then Rebecca DeMornay and Don Johnson, the stars of this 1993 movie, come off as a couple of erotic samurai. She is a hotshot defense attorney and he is her randy client, an accused wife-killer. The two use sexiness as a weapon: thrusting with an innuendo, parrying with a smile. Directed by Sidney Lumet in his coolest, smoothest style, this is an erotic thriller of some accomplishment and some flaws, but it’s also funny. And the humor turns precisely on the easy grace and playfulness with which these actors, public sex objects of longstanding, manipulate their on-screen allure (Showtime Monday at 3:45 a.m.).