What's the male equivalent to a mistress?

Question

Like, if you're a female having an affair with a married man, you're the mistress. But what if you're a guy having an affair with a married woman? What does that make you?

Answer 1

It makes you her "Lover"..

Answer 2

An adulterer, a playboy, a horn dog, a playa, boy toy, or just an affair.

Answer 3

Mimbo  

Answer 4

gigolo

womanizer

philanderer

Answer 5

Consort.

Answer 6

Depending on who the husband is, it could make one an unidentified body in the morgue.  

Answer 7

an idiot