If she’s your girlfriend; the above rules aren’t applicable since you’d already been sexual with her. If you’re bad at it [bad timing], it’d fuck you up and you’ll loose the girl.
If you’re half-way decent at it: you’ll be looked at as a sex God by women whom you come in contact with.
These were women I had NOT been previously intimate with. But they all led to real sex almost immediately after. In the age of sexting, phone sex is like forgotten lore. The last time I’ve actually heard it referenced in the mainstream was during American Pie 2. Remember my 80/20 rule – 80% normal conversation, 20% flirting.
Even then it was shown to be awkward and unsuccessful. I want to prove how phone sex can be an incredibly fun and sensual experience for everyone. I usually speak with women for an hour or more before getting intimate over the phone. That means you want to regularly sprinkle in: These are your litmus tests to gauge her interest. As long as she’s responding well (laughing, flirting/teasing back, is still engaged in conversation) progress to being more bold and sexual.
That is how you introduce dirty talking while on a dinner date or any date for that matter. Generally, you can get away with murder when it comes to a girl you’ve already shagged. My crystal ball says that you’re thinking about sex on the beach right now. I’m popping a mean fucking boner just from having a casual chat with you”! It’d be pretty stupid to go up to a girl at the bar and say to her: “You have a nice ass and it’s getting my cock hard”. But for the average Joe reading this, an approach like that will totally crucify you and set off the creepy rape-alert inside the girl’s head.