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Uh, alternative to “mistress”... Mass media not ready for “fuckbuddy”, I guess, and it is gender-ambiguous. “Side-meat” much too demeaning…
Maybe “part-time partner”? Or just “playmate”?

Well, if you want a gender neutral word that also means “lover of someone who’s already married to someone else,” there’s always “paramour.”

“Concubine” brings to my mind a kind of secondary wife, an institutionalized wife-like relationship that’s not as good a deal as the one that was given to the first wife. Though I suppose that’s only one of the word’s definitions; it’s just that it’s the one I think of first.

I think it could be a case of “dirty” being, like Nekobawt said, a sort of sick, humiliated feeling one would get upon realizing “I thought I knew this person. I didn’t know ANYthing.” Feeling that your whole life is contaminated because all this time you’ve been thinking about mundane stuff, he’s been thinking about how soon he can get away from you to see someone else. But, I don’t know that she’d choose the word “dirty” in that case. Humiliated/embarrassed/stupid/ashamed are easy words to think of. News of the World would just LOVE the word “dirty,” though and I doubt that the reporter stopped to ask “Why would you say that?”

Another possiblity: Maybe Lawton imagines Elin Woods as a prissy, pearl-clutching, holier-than-thou sort. In her mind, Mrs. Woods will now think that she’s been somehow defiled by having had sex with a man who was having sex with women who she (the wife) would consider beneath her.

I’ve heard/read mental health professionals use the phrase “affair partner.” That’s about as gender- and value-neutral as expressions come.

In either case, I’ll bet that at least one of the women who are saying they were seeing him will have “written” a book, been a contestant on a reality show or appeared in Playboy by the time baseball season starts.