Hello 3 catstoo, I think I should probably answer your question as the thread you are referring to was started by me. As you will have seen, it stirred up a really interesting, and fervent, mix of responses.
Cybersex is not one single thing. But in its simplest form, it involves people connecting with each other via the internet, in a virtual world, by using either the written word or webcams.
The cyber part is that it remains in the virtual world.
If webcams are used, it is pretty self-explanatory. Two people connect up their webcams and tease each other until they are both totlly naked, probably adopting very provocative poses and actions.
If it is through the written word, it would normally happen either in a chat room or via one of the messenger programmes such as MSN or yahoo. What happens here is two people either just talk about sex, which can in itself be a turn on. Or they act out a fantasy of having sex with each other (usually while embodying a virtual persona, i.e. possibly the secretary and the boss) and do so by typing their actions.
The thing to be wary of is you do not know for sure who you are talking to and, while the fantasy of sharing intimiate thoughts with a 6 foot, well hung young hunk might be very exciting, he could actually be a sad old man stuck in front of his pc!
Hope that answers your question.