If you are single you can do what ever you wish, once you are in a committed relationship, unless your significant other gives you the green light it is cheating. Quit a a few of the previous postings indicate more than just JO, was going on. As the focus is Married men and not just men then, well you know.
Most important, guy A tells his wife, he is going fishing and will see her later / going to help his friend fix his car / going to watch the game or what ever. As long as you have to hide it from your wife it is pretty much akin to cheating. How many of the previous answers indicate they would but, someone in their small community would find out .
I hate to tell this to you ; but many women get pissed off when their guys masturbate or sneek watch porn, when they have a perfectly good and willing wife waiting for them. To sum things up, single go wild, wank 10 times a day, go to JO clubs and attend JO circles. Once you are married, the definition changes a little