WordNet (r) 3.0 (2006):

lady killer
    n 1: a man who takes advantage of women [syn: seducer,
         ladies' man, lady killer]

Moby Thesaurus II by Grady Ward, 1.0:

71 Moby Thesaurus words for "lady killer":
   Beau Brummel, Casanova, Don Juan, Lothario, Romeo, amoroso, beau,
   blade, blood, boulevardier, boyfriend, caballero, cavalier,
   cavaliere servente, clotheshorse, coxcomb, dandy, debauchee, dude,
   esquire, exquisite, fashion plate, fellow, fine gentleman, flame,
   fop, fribble, gallant, gay deceiver, gay dog, gigolo, heartbreaker,
   inamorato, jack-a-dandy, jackanapes, lecher, libertine, love-maker,
   lover-boy, macaroni, man, man-about-town, masher, necker, old man,
   petter, philander, philanderer, profligate, puppy, rake, rakehell,
   rip, roue, rounder, seducer, sheik, skirt chaser, spark, sport,
   squire, sugar daddy, swain, swell, swinger, walking phallus,
   wanton, wolf, woman chaser, womanizer, young man