Are we moving too fast?

Don't go in to the meeting thinking "I want to have sex with him," because there's a chance (however small, after all, he is a guy) that he may not be thinking the same thing. You might put him off, and even if you are both thinking about sex, that might become what your "in person" relationship might become based on, and that would be a little tragic. Spend some time with him first. After a good weekend or whatever, though, sex might be totally on the books. You'll have to see what happens when the time comes.

My strong advice would be to take a deep breath, and slow things down a little. I understand you have been communicating with your boyfriend for 4 months, and that you are getting along great. But it's important to keep in mind that you have never actually met each other, or spent time together. Until you have done that, and REALLY gotten to know him, you should not be sleeping with him. He may well be "The One". If so, you will hopefully be spending your lives together, and there will be plenty of time for all sorts of things (including sex). But you must admit that there is at least SOME chance that he is not The One, since you haven't even met him yet. So be optimistic and excited, but also be smart, and take things one step at a time. Good luck!