Excessive flirting forbidden

One of the rules at the entrance of a club in Shibuya caught my attention:

“Excessive Nampa (trying to pick up a member of the opposite sex) will NOT be tolerated.”

This is the mentioned sign. Notice the other funny rules like “No sleeping”

“Nampa” (軟派 [なんぱ]) can be translated into English as “hitting on someone”, “flirting” or, as explained in the sign, “trying to pick up a member of the opposite sex”. I wonder where is the limit between “Nampa” and “Excessive Nampa” 🙂