Interesting point Rebus.

That happens when the girl has to drive back home at the end of the date. Even though you knoooow she's going home with you she's got that things about not drinking before going behind the wheel.

Either you escalate sober or you playfully get her to commit to spending the night with you at the start of the date.

Cocky approach but that's what I have done for years and it kicks the date into higher gear:

Now, If she doesn't drink for any other reasons. I agree with Rebus, the escalation is slower.

But let's keep digging on their side.
If this is a Day2 and you made a really good impression the first time. She's going to feel nervous on her big date. She's told all her friends about it and she wants to make a good impression too.

In this situation, most girls will definitely have a few drinks to take the edge off but not so many that she'll start being drunk.

Exceptions are rare, don't you think?