Not a wife, but one of the Japanese girls I'm messing with is married, I used to kick it with her when she was in New York City, but we didn't mess around, but it seemed like when she went back, she developed a liking to me, and we used to talk dirty and she'd masturbate on phone while I talked dirty and I'd hear her cumming and shit. She expects me to fuck her when I see her in a few months. She wants to divorce her husband, but I don't want to fuck her if she's divorced, then she'd be a burden on me, since she'd be widowed, and I'm sure when she has some of this, she ain't going to want to stop getting it.
I have fucked A LOT of guys girlfriends, even one of my associates girls, but they totally asked for it.