After you’ve been on a first date there is nothing to gain from withholding interest.
If you’re concerned about looking uncool or too keen, stop worrying, you’re fine.
And even if your date was really keen, the fact that it took you 3 days to respond to them might put them off and you could never hear from them again. Let’s say you do decide to wait a few days to text or call someone after a really nice date, or to reply to a message your date has sent you.
If they have any sense they will have found someone a bit more worthy to go out with – someone who will get in touch with them when it matters.
In addition, if you buy her a fancy schmancy dinner at some ritzy place, she won't be able to turn down your request for a 0 "loan" until you can "get to the cash machine." Good investment. Girls do this stare at the phone thing, makes them all anticipatory. Call her in a couple of days or if you get horny again.
This is because they don’t want to appear over eager.
She only wants to talk about relationships and girl stuff anyway. In the meantime you can flirt with the other girls on the dance floor.
Buy her a nice meal, so that she knows what she owes you in exchange for the meal.
What’s the point in waiting three days to find out whether your date liked you back?
Ask the day after the date, and then you can either arrange another date and start to develop a relationship, or simply move on quickly. Unfortunately we often seem to have a habit of seriously over complicating things!