Other forms: libidinously
When you're libidinous you're driven by your libido, meaning your sex drive. When you describe someone as libidinous, it's usually not a compliment, since the word suggests being out of control with lust and desire.
The word libidinous comes from the Latin word libido, meaning "desire," a word the world relearned from Sigmund Freud in the early 1900s. Freud believed that the libido is one of the powerful motivating forces for people and that psychological health is determined by how well a person controls and focuses it.