Morality questions aside, I'm wondering how the married men who do partake, manage also to "keep up their relationship" with the wife. Don't questions arise, such as -- personal sense of trustworthiness (you know she doesn't want you to do it, but you do it anyway, so then how do you "make a good showing" to the wife, keeping a straight face?), sexually transmitted disease risks, spending time away from the wife, being less (or more) interested in the wife's sexual appeal in inexplicable patterns, etc.
I really don't want to judge men who both (a) have a married partner (the WIFE) but also (b) have sex with other women. Really, it's their choice, and I think a forum like this one here should support men's choices in these matters. What I'm asking, instead, is, how do you get away with it? Not only, as regards getting away with fooling your wife; but also, as regards, getting away with talking to yourself, perceiving yourself. Is there guilt? Worry? More stress? Less? No big deal? Huge deal that you have to organize your entire life around?
See where I'm going? I'm interested in the practical consequences (and I really HOPE nobody turns this into a morality-bashing or morality-trumpeting thread, because I'm genuinely interested in some of the answers).