Is it illegal or unlawful to be a concubine? How is it any safer then being a prostitute? Can a mistress be a happy woman? What are the benefits and what's the down side of being a person in these positions? What if you were born as one? A concubine is a woman who lives with a man in a situation which is simular to marriage, although without the priveleges of marriage. A mistress is a woman of power. A prostitute is a woman who have sex activity for often times money? I'm not sure that I can tell the difference between the three. Is one better or different of the other?