lib·er·tine
noun/ˈlɪbətiːn/
/ˈlɪbərtiːn/
(formal, disapproving)- a person, usually a man, who leads a life that is not moral and who is interested in pleasure, especially sexual pleasure
放荡的男人；放荡不羁的人；浪荡公子 Word Originlate Middle English (denoting a freed slave or the son of one): from Latin libertinus ‘freedman’, from liber ‘free’.