Know who they are?

Sure you do.

The other woman.  

The "I will write a book, tell all, capitalize on my relationship with (Charles, Norman, John, Bill, and Henry. Like in the 8th, that Henry) which I throughly enjoyed while it was happening, and I really really loved him" other woman. 

Except, that is, for Camilla, who actually got her Prince and to the best of my knowledge did not, yet, write a memior about skulking around the palace for a quickie behind the throne. The Other Boleyn girl got the book and movie, much to the chagrin of Anne.

And books, clearly, are the way to go.

Carole Mallory has written "Loving Mailer" a tell all of her 8 year affair with old Norm. The counterpoint of a view of life with him is from Norris Church (wife number 6) entitled "Ticket To The Circus."  No wonder with all his cavorting his writing seemed stalled.

So for all the would be "honey's on the side" it's pretty clear that in addition to the purported pleasure of a romp or two, (or lots more) taking notes is a pretty good follow up to the act. 

If the relationship sours the upside is a book deal. Could be worse, I suppose, she could actually wind up the philanderer. And why, pray tell, would she want that?