There is something so freeing about being constrained. When you know that you simply cannot go beyond a certain point, it is easier to let yourself go and just enjoy yourself. Think about roller coasters where you spend half an hour securing your seat belts and safety bars for a five minute thrill ride. Once you are that secure it is easy to enjoy the adrenaline rush from plunging 100 feet straight down. Without the safety bar, the adrenaline will only fuel your fear. The same is true in the bedroom. A submissive knows that they can truly let go when they are bound. Then their body is taken care of and they only need to feel the sensations their Dom inflicts upon them. This of course only works when all the safety precautions are taken and respected.