Well, yes and no. I didn't actually have cyber-sex, however, I did partake in making other think they were having it and then laughing at their expense.
When I was 14, my friend and I would go to AOL chat rooms and pretend to be girls. Of course in moments tons of guys would message us. We picked the most desperate sounding guy and pretended to be interested in him. We'd talk about fake girl crap for a few minutes and slowly mention cyber sex.
He'd get all into it and we just assumed he was in midstroke as we announced that we weren't girls and proceeded to laugh at him and call him names. Of course the guy would get incredibly pissed off and type every obscenity known to man in CAPS! lol
Torturing people can be fun.