Hi, Thanks for writing in to us. From your description, it looks like you are preoccupied with thoughts that after masturbation, the sperm are all over your skin and you need to get it clean and also to prevent a girl from getting pregnant. These thoughts are kind of interfering in your daily activities too. These are labelled as obsessive thoughts and you might be suffering from such a problem. I would suggest you to consult a psychiatrist and explain your problem in detail. In reality, sperm are produced in very less quantity and are not dirty in any way so as to scrub yourself. There chances of making a girl pregnant are nil in your situation. You can clear your thoughts after discussing the realities about masturbation with your doctor. Hope this helps