immoralist

noun

1. An advocate of immorality

   “WHEN it comes to poking serious fun at High Society and making a quiet mockery of its hypocritical ways there’s still no one one^([sic]) to match the Victorian age’s master of homosexual immorality, Mr Oscar Wilde. […] Wilde, being a first-class subversive, implies that the Wicked Lady, an unshamed adventureress and serial lover, ought be admired for the courage of her convictions: by contrast he mocks the aristocrats as immoralists desperate to be caught in a good light.”

2. An adherent or practitioner of immoralism