How do you turn a guy on over the internet?

If it's only through typing you say dirty things and go into a lot of description. Imagine what things you what to do to him or what he wants to do to you and go into full detail. I.e. wanting to rub wet oil all over their body and lick all around them. If it's on webcam that's easy! Pull the straps down off your shoulders and glance at them and act all shy. They'll beg for you to remove more. Take some clothes off and basically copy what porno girls do - the traditional sucking of your own finger does the trick