Skype is good for sex chat
Even though you might be thinking, "My God, those are the greatest pectoral muscles in the history of pectoral muscles," there's no way for your partner to know that unless you spit it out. Personally, I couldn't care less if there are naked pictures of me on the internet, since there already naked pictures of me on the internet. Skype and most other video chat services include a little picture of you nested in the big picture of the person you're chatting with. The person you're all twitterpated over could turn out to be a jerk.That's nice, because it means that if you try to screengrab their bits, you're going to get your bits all up in the photo, too. If it really makes you uncomfortable (remember: dies on the internet. If you're cool with that risk, know that you're in charge of what your partner sees.
Otherwise, why are they wasting their time and your time? In we're-in-the-same-room sex, there's a simple formula for effective dirty talking.
It can also be performed using webcams, voice chat systems like Skype, or online games and/or virtual worlds like Second Life.