In beyond good and evil by Nietzsche, he says all living beings desire to discharge their strength.
To me this is a very interesting idea, because this challenges what we typically think of standard physiology.
For example, we are taught that as your workout, and after your work out you become stronger. But what if, the correct order is that we must simply work out in order to get rid of our excess stream. Thus perhaps we get stronger simply as we keep blowing off our excess steam and power?
The sexual instinct?
Perhaps this notion can also be applied to the sexual domain. We men desire to blow off our excess sexual steam … and this buildup is what motivates us?
But if you blow your stream, what motivation do you have to do anything besides take a nap and sleep? Thus perhaps some level of sexual chastity is beneficial to our artistic and creatively productive pursuits.