Lib·er·tine

A person, especially a man, who behaves without moral principles or a sense of responsibility, especially in sexual matters.

A person who rejects accepted opinions in matters of religion; a freethinker.

Characterized by a disregard of morality, especially in sexual matters.

Freethinking in matters of religion.

Libertine: late Middle English (denoting a freed slave or the son of one): from Latin libertinus ‘freedman’, from liber ‘free’. In the mid 16th century, imitating French libertin, the term denoted a member of any of various antinomian sects in France.