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		 The only risk I've ever heard from holding it is very minor.  Mostly, it's good practice for learning control so you can last when you're with a girl later. 
 
The one risk i know of from holding back is that you can have a retrograde ejactulation.  It doesn't do any harm, but it defeats the purpose of holding back and can become a habit.  What IS a retrograde ejaculation?  It's when you come, but since it can't go out the front, it ends up in the bladder. 
 
So again, the only risk here is developing a habit of ejaculating in a less satisfying manner.  Small risk, and one that you can counteract.  So yeah, practice holding it.  Your lover(s) will be the happier for it.  If you DO have a retrograde ejaculation, just don't do it again anytime soon.  Don't form the habit, and you're all good. 
		
		
		
		
		
		
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