I had a similar situation so here is my experience plus advice. 5 minutes into our first date we were making out, we kept going at it throughout the date wild make out sessions......we only had 1 date
I guess sometimes you do such a great job at teasing a girl and getting her hot before your first date (plenty of dirty phone messages just like your situation) that you completely destroy her anti slut defense and she gives herself to you fast because you got her hot to the point she can't take it anymore!
Sometimes after such successful first dates they get their ASD thoughts and start feeling like a slut, think you took advantage, get angry at themselves for letting themselves go, don't see you anymore as relationship material, they don't want to see you again. It happened to me, I couldn't help it she was hot, however I didn't pay her the attention she deserved after our date. If you end up in a situation like mine (wild first date foreseen due to the content of phone conversations) and you want a relationship, then you need to act like you want a relationship. Make her your gf, ask her on a follow up date, call her on the phone etc etc. Take an interest on her if not your great first date will turn into a 1 hit wonder.
This advice is assuming you will end up in a situation like mine due to the girl already engaging in sexy talk on the phone prior to the date. The thing is most girls will not engage in such talk with a guy prior to a first date unless they are already hot for you. If you don't end up on a wild make out session with such a girl it will probably be your fault, all you have to do is kiss her!
The best advice I can give you is to keep up the dirty messages and make sure they are about you and her (if not already). Talk about you 2 involved in sex/kissing etc etc. PM me if you want a list of things I said to my date that got her real hot.