A dissolute person; usually a man who is morally unrestrained WordNet 3.0 & Open English WordNet

A libertine is a person devoid of most moral principles, a sense of responsibility, or sexual restraints, which they see as unnecessary or undesirable, and is especially someone who ignores or even spurns accepted morals and forms of behaviour observed by the larger society. Wikipedia

One free from the restraint of social norms and religious morals. Wikipedia Disambiguation

Person who rejects common moral or sexual restraints which they see as unnecessary and/or undesirable Wikidata

Somebody who is debauched; somebody who is dissolute and acts without moral restraint. Wiktionary (translation)

Someone (especially a man) who takes no notice of moral laws, especially those involving sexual propriety; someone loose in morals; a pleasure-seeker. Wiktionary

Someone loose in morals. Wiktionary (translation)

One who rounds; one who comes about frequently or regularly. Wiktionary