adulterer, fornicator - someone who commits adultery or fornication

bad person - a person who does harm to others

gigolo - a man who has sex with and is supported by a woman

profligate, rake, rip, roue, blood - a dissolute man in fashionable society

ladies' man, lady killer, seducer - a man who takes advantage of women

swinger, tramp - a person who engages freely in promiscuous sex

debaucher, ravisher, violator - someone who assaults others sexually

philanderer, womaniser, womanizer - a man who likes many women and has short sexual relationships with them

immoral - violating principles of right and wrong