A word of advice to all those saps on the verge of falling prey to the erotic charms of the noir femme fatale: Don’t let the little head do the thinking for the big head. Sure, steamy sexual encounters with dark and mysterious strangers have their immediate rewards. But when that raven-haired beauty starts screaming “Kill my husband, baby! Oh god, yes—kill the fucking bastard!” during happy time, you need to get the hell out of Dodge. Such is the case in John Dahl’s 1994 neo-noir flick The Last Seduction, starring sultry sexpot Linda Fiorentino as a manipulative, self-serving sociopath who—after running off with the $700,000 her doctor-husband made by selling medical-grade cocaine to drug dealers at her request—convinces some poor small-town yokel to whack her old man for a piece of the, uh, action. Murder, double-crosses, twist endings—he should have seen it coming. Witness the perils of unsafe sex when the film screens at 7 p.m. at the Library of Congress’ Mary Pickford Theater, 101 Independence Ave. SE. Free. (202) 707-5677. (Matthew Borlik)