That is true, I didn't originally know about that path. In hindsight, how to get it is somewhat intuitive - though I was oblivious to it the first time, thinking that choosing to scream "PINEAPPLE EXPRESS" at every opportunity would have MC come off as insecure, or worse, "end" the game early.
How I expect to get NTR or cheating in games is different though: by ignoring, or being indifferent to the needs of the wife. I prefer when they fall in love or get seduced by other men because MC is doing the "wrong" things as a husband; not because MC tells her she shouldn't be wearing a bikini in front of my best friend (insecurity).
One thing a lot of players here pointed out, with the latest update to EtBA, is that the cheating path is "hidden" behind the "Amateur Porn" dialogue option - which is head-scratching, if I am being honest. There is no cognitive path to where that leads to the wife cheating on you, in fact, it should be the vanilla path where it leads to the couple recording themselves.