a woman (other than the man's wife) having a sexual relationship with a married man.
so no, stupid harlequin men, you can't have a mistress if you're not married and calling your lover your mistress if you're unmarried is, not only the weirdest thing you could do but alsp highly offensive as that implies an immoral relationship
the official definition of mistress:
a woman (other than the man's wife) having a sexual relationship with a married man.
so no, stupid harlequin men, you can't have a mistress if you're not married and calling your lover your mistress if you're unmarried is, not only the weirdest thing you could do but alsp highly offensive as that implies an immoral relationship