libertine

Concise Oxford English Dictionary © 2008 Oxford University Press:
libertine /ˈlɪbətiːn, -tɪn, -tʌɪn/

▶noun

• 1 a person who is freely indulgent in sensual pleasures.

• 2 a freethinker in matters of religion.

▶adjective

• 1 characterized by free indulgence in sensual pleasures.

• 2 freethinking.

– derivatives
libertinage noun,
libertinism noun.

– origin ME (denoting a freed slave or the son of one): from L. libertinus ‘freedman’, from liber ‘free’, influenced by Fr. libertin.