Granted, sex has a certain biological function, and that function is to produce offspring.
But if God didn't want us to use it for recreation, why would He have made it so much damn fun?
Why indeed?! 
Psychological factors are responsible for about 10%-20% of all cases of ED. It is often a secondary reaction to a fundamental physical cause. They often base from nervousness, performance anxiety or fear of failure during lovemaking. Psychological factors in impotence are often secondary to physical causes, and they magnify their significance. http://www.besthealthmed.com/
cau...uses_of_ed.html
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