If you are checking out pr0n, that's like looking at playboy, which I would consider as masterbating... If you are having the cybersex, that is actually interacting with another living person which is just like cheating with a person standing next to you(except safer cause you can't catch their STDs).. In other words, it involves two people, and you could actually have a two sided emotional attachment, instead of a 1 sided attachment, such as you would have with pr0n. I would say if the other person is doing it of their own free will, and you are not paying them, then it is cheating. If you are paying them it is more along the lines of a prostitute or a stripper... which some people might or might not consider cheating.