The Collaborative International Dictionary of English v.0.48:

Love-making \Love"-mak`ing\, n.
   1. Courtship. --Bacon.
      [1913 Webster]

   2. Sexual intercourse.
      [PJC]

WordNet (r) 3.0 (2006):

lovemaking
    n 1: sexual activities (often including sexual intercourse)
         between two people; "his lovemaking disgusted her"; "he
         hadn't had any love in months"; "he has a very complicated
         love life" [syn: sexual love, lovemaking, making
         love, love, love life]

Moby Thesaurus II by Grady Ward, 1.0:

112 Moby Thesaurus words for "lovemaking":
   Amor, Christian love, Eros, Platonic love, act of love, admiration,
   adoration, adultery, affection, agape, aphrodisia, ardency, ardor,
   ass, attachment, balling, bodily love, brotherly love, caritas,
   carnal knowledge, carnality, charity, climax, cohabitation,
   coition, coitus, coitus interruptus, coldness, commerce, congress,
   conjugal love, connection, copula, copulation, coupling, desire,
   devotion, diddling, faithful love, fancy, fervor, flame, flesh,
   fleshliness, fondness, fornication, free love, free-lovism,
   frigidity, heart, hero worship, idolatry, idolism, idolization,
   impotence, intercourse, intimacy, lasciviousness, libido, like,
   liking, love, making it with, marital relations, marriage,
   marriage act, married love, mating, meat, onanism, orgasm, ovum,
   pareunia, passion, physical love, popular regard, popularity,
   potency, procreation, regard, relations, screwing, sensuality,
   sentiment, sex, sex act, sex drive, sexiness, sexual climax,
   sexual commerce, sexual congress, sexual instinct,
   sexual intercourse, sexual love, sexual relations, sexual union,
   sexual urge, sexualism, sexuality, shine, sleeping with, sperm,
   spiritual love, tender feeling, tender passion, truelove,
   uxoriousness, venery, voluptuousness, weakness, worship,
   yearning