Now I lay me down to cheat-David Allen Coe
One bourbon, one scotch, one beer-John Lee Hooker
Window up above- Mickey Gilley
Faded love-Patsy Cline
Reasons I cheat-Randy Travis
Buenas Noches from a lonely room (She wore red dresses)-Dwight Yoakam
I guess you can detect a certain bias in my list but the best cheatin' songs are C&W hands down.
There's another infamous one by David Allen Coe, but I can't print the name here. If you know which one I'm talking about, you're probably already smiling (shame on you!). ;-).
That's a cheating song? It sounds more like a drinking song?