What a lousy rule. He is an adult who is about to be a multi millionaire. What's wrong with bringing a lady back to his place. It's unAmerican....
I bet part of the class is about gold digging woman who wait out side games or hotels for players to bring them back to the rooms, just to fool them into getting married then to just divorce a year later (or after the big contract) and loose half their money.
So part of the No guest allowed is to show restraint. Could just also be for safety sake for the guest so if some thing happens they don't blame the NBA.
Bottom line is, they are there on the NBA's dollar, and if thats what the NBA wants, they should follow and not fool around.
Thats what the regular season is for! 
I get what your saying and agree, but he is an adult and responsible for himself. If he is stupid enough to blow it away, hopefully he will learn a valuable lesson. If not, then it's his problem.
If he is an adult and responsible for himself then the responsible thing to do as an adult is to follow the rules of the seminar. Part of the seminar is teaching these older boys the consequences one might come across if you still act like the child you acted like in college. It is a seminar to teach these older boys how to act like men and adults. Clearly this point was lost upon the child that is Shabazz Mohammed.
Men don't give men curfews and tell them they can only have preapproved guests in their rooms unless they have control issues or other issues.
I'm definitely curious how many of you have had jobs where you went to a seminar or went to a recruiting trip and they gave you a curfew and said you could only have preapproved guests in your room.
Were there any other rules? Keep elbows off the table perhaps? No gum? Will they start telling Violet Palmer she has to start wearing skirts that come down 3 inches below her knees?
Can the guy play basketball? Well then.
And do any of you actually think these things help and work?
This is a league where players can't name their kids, but oh man. That Shabazz. He is just bad news. Typical NBA and society in general. Punish a minor symptom. Never address the illness.