(n.) An unmarried person, male or female, who has criminal intercourse with the other sex; one guilty of fornication.

Casanova Don Juan Lothario Paphian adulterer amoral bestial broad-minded carnal debauched debauchee debaucher decadent degenerate depraved dirty dirty old man dissolute fast filthy fornicator free lance free spirit free trader freethinker freethinking gallant gay deceiver gay dog goatish heartbreaker hircine horny immoral incontinent independent individualist isolationist lady-killer lascivious latitudinarian lecher lecherous lewd liberal libertarian libidinous licentious lover-boy lubricious lubricous lustful masher mugwump neutral nonpartisan old goat open-minded philander philanderer philandering profligate prurient rake rakehell rakish randy reprobate rip roue rounder rugged individualist ruttish salacious satyric satyrical seducer skirt chaser swinger third force third world tolerant unbigoted walking phallus wanton whoremonger wolf woman chaser womanizer