The Collaborative International Dictionary of English v.0.48:

Inamorato \In*a`mo*ra"to\, n.; pl. Inamoratos. [See
   Inamorata.]
   A male lover.
   [1913 Webster]

WordNet (r) 3.0 (2006):

inamorato
    n 1: a man with whom you are in love or have an intimate
         relationship

Moby Thesaurus II by Grady Ward, 1.0:

33 Moby Thesaurus words for "inamorato":
   Casanova, Don Juan, Lothario, Romeo, amoroso, beau, beloved,
   boyfriend, caballero, cavalier, cavaliere servente, esquire,
   fellow, flame, gallant, gigolo, lady-killer, love-maker, lover,
   man, necker, old man, petter, philanderer, seducer, sheik, squire,
   steady, sugar daddy, swain, sweetheart, truelove, young man