I don't RP but i have seen how RP'ing can lead to relationship issues. So i say yes its classed as cheating. As your sharing something quite intimate with someone, and your getting emotional pleasure out of it. And i agree with the trust betrayal too. As its the same as sending naughty texts, doesnt matter what character your playing, its still you emotionally.

:P Never cheated on my BF, wouldn't want to and have no desire too. Hes too awesome :D my little Piece of Cheese XD

One of those things that you need to discuss beforehand.

With my ex, yes, I counted it as cheating because we discussed it and said "we're not going to do this". We agreed that it was cheating. Newsflash, I may have been one of hundreds here: he did it anyway. Many times. Many, many times.

In this sense, I understand how it can fucking hurt. On the other hand...I genuinely don't mind my partner now doing it. I don't mind him being flirty or anything. We did talk about this also and agreed that it was okay between us. I personally have no inclination to do it but he can if he wants to / if I'm not around. Online only though! :p

Giving my side, I'll say that it totally depends on the couple. I mean, there are some idiots who think masturbation is cheating. See my point?

YAY worms, omnomnomnom!

Now I'm a bit muddled on this topic. I'd say, technically, following the exact definition that roleplaying sex with another person is not cheating as it's not actual sex/sexual touching, it's simulated. Anymore than looking at porn is cheating (although some people class looking at porn as cheating... eeeeh).

But at the same time... it is definitely a betrayal of trust and can be devastating to find your partner is doing that and have the same emotional repercussions as cheating. It shows (at least when it's done behind your back) a lack of commitment towards your partner and a severe disregard for their feelings.

Personally. Yeah. I'd count it as cheating.
That stuff is kinda private and personal between couples.

I mean. Some people if agreed before hand that it is not then maybe it's different (not that I'd ever do that)

Basically I'm old fashioned believe that if you are in a relationship sex is only something between you and your partner. Even if it's virtual.

Yes it is.
You have listed good reasons why.

I can think of another reason for why I consider it to be cheating.
I think it introduces the idea of cheating as a part of a fantasy. It might be thrilling to get away with it over and over. People with certain personalities can sometimes allow themselves to become accustomed to the thrill and then have to shift the thrill more and more extreme as time passes. It can, of course, this is for a person with no will, go all the way up to real life cheating if it carries on for long enough.

Besides that it is:
-Dishonest (Tell your companion what you want, make it clear and stand by it)
-Rude (To go behind someone with whom you are committed is really rude to your companion; it almost says to your companion that they can never measure up to your expectations.)
-Selfish (Seeking a thrill with others when you have it in your grasp, all it usually requires is some interaction with your current companion. Use that time with your companion; not some stranger!)
-Lazy (This one runs hand in hand with the above...It might be there was some tension with your companion...Instead of taking an easy way out, work on what went wrong. You'll improve as a person after it, if you learn from it.)

I could go on.

Guess Im biased becuase it's been done behind my back few times , destroyed relationships for me and impacted on my trust alot!

I think morally if you are asking someone else for sexual pleasure whether IRL or digitally and you already have a partner ( and they dont know about it ) then it could be a bad sign your relationship is starting to show signs of fracturing.

I don't think it really matters so long as both are ok with that sort of thing. the important thing is that where ever one draws the line the other has to accept that. If you go out of your way to cover it up then you probably shouldn't be together.
Personally for me that would be crossing the line