Online dating is my sweet spot! Here's what you do:
1. Set the date up for a week in advance (does it really have to be THAT long before the date ALL the time??)
2. After you set the date, you say, "Great! Soooo.... in the meantime, u up for playing a little game?" She'll say "I dunno" or "sure!"
3. Ask her to play the game 20 questions with you. Simple rules: you ask her a question; she answers it, then she asks you a question. The rules are that both of you can ask anything you'd like. (Note: if she's game to play this, she's definitely got a pretty high starting interest in you).
4. For the next week, you play this game with her. Assuming you answer her questions at the right pace (and she answers yours as well), you should be asking/answering about 3 questions a day if your date with her is in a week, or 2 a day if it's within a week and a half.
5. The questions you start out with should be relatively tame in nature. As the game progresses, you can start asking questions that are a bit more... shall I say... "interesting." In other words: don't start off with sex questions: ask normal life questions first (what's your favorite color, best vacation you ever had, etc.) then around question 5 ask something slightly provocative (i.e. what kind of clothes do you like to sleep in), then a few more normal questions, then another more provocative question (i.e. wildest place you've ever THOUGHT about having sex), then a couple more normal questions, then a provocative question... you spread out the provocative questions so that she won't think you're just trying to get her in bed. At the same time, though, it allows her to start thinking about you in a sexual way. You'll really be able to tell how comfortable she is with you when she starts asking YOU these types of questions.
6. For the 20th question... one, don't make it a sexual one. Two, you can either ask her a question, or say something like "And question number 20.... actually, I think I'll ask that one in person
" This will leave her wanting to know what the question is, thus upping her excitement at finally meeting you.
Note: I have done this game a few times with women online prior to meeting them. In each scenario, I was making out with them on the first date and banging them by (or before) the 2nd one. So.... yeah, definitely something to try out. Hope this helps!