My wife and I had both cheated and had sex with affair partners. For her, cheating sex is much more exciting and she always cum much faster. For a moment it made her feel she was in her 20s again. For me, it was the flirting and anticipation that was more exciting than the actual sex. After the first few times of sex, I already felt it wasn't as good as with my wife. Maybe iits just me that I have a comfort zone there with her.