First post but figured I would jump right in....
I have very close friend who studied various external forms of martial arts which were all centered around internal martial arts, or Qi Gong.
His Master told him that in China (i believe this was hundreds of years ago) that a fighter would have sex with a young, strong, and healthy girl before fighting because of the exchange of Qi energy it would give them. There is even a technique which is still taught today to extract this internal energy from your woman.
I have abstained from wacking / sex for 3 weeks while at the same time focusing on meditation daily. I can absolutely tell you that it has made me more level headed, centered, focused, balanced, and able to think / respond quickly.
This topic is much too deep for me to fully explain here, but I thought I would just offer my own experience.