List two common dating rules that parents often enforce with their children.

OK so basically one would be a curfew and the other depending on the age will be don't have sex unless both let's say 18 it would be always be safe and use a condom. But if that isn't something another thing enforced would be that there needs to be a neutral respect towards each other 

They often enforce a curfew and discourage sex.

Probably because you wake up early. even when i get a good nights sleep i still feel tired if i wake up early. or maybe you just need coffee.