The Collaborative International Dictionary of English v.0.48:

libidinal \libidinal\ adj.
   Of or pertaining to the libido; caused by libido; as,
   libidinal gratification; libidinal impulses.
   [WordNet 1.5]

WordNet (r) 3.0 (2006):

libidinal
    adj 1: belonging to the libido; "libidinal impulses"; "libidinal
           gratification"

Moby Thesaurus II by Grady Ward, 1.0:

51 Moby Thesaurus words for "libidinal":
   amorous, appetitive, automatic, carnal, desiderative, desireful,
   desiring, desirous, eager, erogenic, erogenous, erotic, erotogenic,
   fleshly, gamic, heterosexual, hoping, hormic, impulsive, inherent,
   innate, instinctive, involuntary, lascivious, libidinous,
   lickerish, lustful, natural, needing, nuptial, optative, oversexed,
   potent, procreative, sensual, sex, sexed, sexlike, sexual, sexy,
   spontaneous, straight, subliminal, tempted, unconscious,
   undersexed, unlearned, venereal, voluptuous, wanting, wishing