Are you sure your sub behaves himself when you are away? Then try this metal penis cage! The cage completely locks up the penis and prevents an erection. The wearer has no way of taking off the cage because the penis is constantly pushes down. The cage includes a lock and keys. Attach the lock to the ring that goes around the balls and it's impossible for your sub to remove the cage. This way you will have complete control for as long as you want.