DEAR ABBY: If a single woman is having relations with a married man, then she is known as his mistress. But what do you call a single man who is having relations with a married woman? Would he be a "mister" -- or what? -- CURIOUS IN MACON, GA.
DEAR CURIOUS: He could be referred to as her lover or paramour. According to the Urban Dictionary, he could also be called a "manstress." (If there is financial support involved, then he's a gigolo and she's a "sugar mama.")