It can be said like the Rules of Dating, or as a rule for Women and men when the are on a date. What do you think about attending a party with your date. What if you are too drunk? It will screw the whole relation. No doubt.
It will be pathetic if you get drunk and act like this. The relation will be screwed. That's why it says Don't drink too much on a date. Of course, you're nervous - but you're also sloppy and talk too much when you do that. Let your date on dance with you on party - don't let her sleep on the floor. :D. Enjoy the night life with your date with limited drinks.