If an individual viewing booth has a door that can be locked by a patron, a little common sense would suggest locking the door is usually sufficient to prevent others from entering an occupied booth.

But, when someone enters an unlocked occupied viewing booth and grabs the occupant's cock and won't let go, common sense would dictate two possible recourses to such an intrusion. One recourse would be to directly look the intruder in his eyes, tell him to let go of your cock, and to get out of the booth. The second recourse would be to grab his nuts firmly and twist them as you tell the intruder to leave the booth. The intruder might have your cock in his hand, but having his nuts firmly in your hand leaves no doubt who has the upper hand in this situation. Unless a guy has a very high pain threshold, you can get him to do anything if you have his balls in your firm hand.

The second recourse is probably the best course of action for someone who does not understand the word "No" or some variation of it. But, then again, locking the door of the booth would have probably prevented the intrusion in the first place.

__________________
Those who deny freedom to others deserve it not for themselves. And, under a just God, cannot long retain it.

-- Abraham Lincoln