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		 MM nailed it, I'm pretty sure. 
 
Menstrual blood can upset pH balance. 
 
Low pH can certainly cause burning on the penis. 
		
		
		
		
		
			
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Overhead, the Albatross hangs motionless upon the air, 
And deep beneath the rolling waves, 
In labyrinths of Coral Caves, 
The Echo of a distant time 
Comes willowing across the sand; 
And everthing is Green and Submarine 
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