Let me tell you a story. This is all 100 % true. When I played Everquest, I was in a guild with a married couple. Awesome people, think the world of them. The wife of the bunch(played an incredible bard), had been in auto accident which left her in a wheelchair, not fully paralyzed, but unable to use her legs well enough to ever walk again. Her husband, who was also awesome, never wavered in his support of her.
Life in a wheelchair caused her to quickly gain some weight, and she felt like much less than a whole woman. About all she could do during sex any more was lay there, her muscles would not coordinate enough that if she tried to move and respond, she would thrash about and make things worse. She started doing cybersex with a couple of the guys ingame, because it made her feel attractive and almost whole again. Her husband knew about it(they have computers in the same room), and not just accepted but encouraged her because it clearly made her happier. He told her as long as it just online, he didn't care, but no other guy was gunna touch her in real life.
So you tell me, cheating or not? Right or wrong?
By the way, as a side note: she has discovered computer generated art, and does artwork now based on fractals. Very successful, has done showings in multiple cities and sells a surprising amount of her art. They have two kids(boys) who also play games online and are just excellent, polite kids who often come across more mature than many of the adult gamers. Some of the most decent people I know, and it is a privilege to call them friends.