li·bi·do 
(lĭ-bēdō, -bī-)
(lĭ-bēdō, -bī-)n. pl. li·bi·dos
1. The psychic and emotional energy associated with instinctual biological drives.
2.
a. Sexual desire.
b. Manifestation of the sexual drive.
[Latin libīdō, desire; see leubh- in the Appendix of Indo-European roots.]
li·bidi·nal (-bĭdn-əl) adj.
li·bidi·nal·ly adv.