If a woman is called a "Mistress" what is the name for

[itsrainingagain]

a single guy that a married woman is having an affair with

guess there isn't really a word because in the past it didn't happen (or at least not much) - or in certain societies was not something even imaginable. Eg Victorian times when women did not like sex - they jus tdid it for their husbands and to have kids (allegedly ).

Bet it did happen a lot though.

but there are words for it

I've listed them already

they're not in common usage, no, but there are words

i still like manstress the best though. even if it is just a word i made up.

Its "adulterer" in the same way it would be "adulteress" - regardless of who is married and who is not in the combination

I always thought it was "lover".

It's a bit old-fashioned, I know, but I can't think of anything more modern which has the same value-charge as mistress.

sleepfinder does an adulterer not have to be married? The single male would not be committing adultery but am open to correction.

Isn't amazing how a woman can be labelled as a mistress but there is no clear label for the guy

no it isn't necessary for an adulterer to be married.
oh and of course it never happens and it never used to happen in the past yeah, right.

no, that's my point- an adulterer / adulteress is someone who messes with marriage, whether it be their own, or someone elses...

so you can have a serial adulterer who is married or one who is not, gettit?