Simple but devious: get yourself a pair of handcuffs/something else with which you can lock your hands behind your back. Then attach a rope to a couple of clothes pins, place them on your body, and tie the end to something in front of you. Now lock your hands behind your back and throw the key where you can't reach it until you pull the clothes pins off.
Starter suggestions: four clothes pins on your stomach. If you survive that and have courage left, next time try one on each nipple or one on each ball.
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