The Collaborative International Dictionary of English v.0.48:

Womanize \Wom"an*ize\, v. t.
   To make like a woman; to make effeminate. [Obs.] --V. Knox.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

womanize \wom"an*ize\, v. i.
   To seek the company of women with unusual frequency,
   especially for purposes of sexual intimacy.

   Syn: womanise.
        [PJC]

WordNet (r) 3.0 (2006):

womanize
    v 1: have amorous affairs; of men; "He has been womanizing for
         years" [syn: philander, womanize, womanise]
    2: to give a (more) feminine, effeminate, or womanly quality or
       appearance to; "This hairdo feminizes the man" [syn:
       feminize, feminise, effeminize, effeminise,
       womanize]

Moby Thesaurus II by Grady Ward, 1.0:

27 Moby Thesaurus words for "womanize":
   be promiscuous, castrate, chase women, commit adultery, debauch,
   demasculinize, dissipate, effeminate, effeminatize, effeminize,
   emasculate, fool around, fornicate, geld, grovel, mess around,
   philander, play around, rake, sissify, sleep around, soften, swing,
   wallow, wanton, whore, wolf