If I may suggest a book,
Taoist Secrets of Love: Cultivating Male Sexual Energy
By Mantak Chia
http://www.amaz on.com/exec/obi … il/-/0943358191
An esoteric explanation of semen retention :) Very interesting. Check out his other book Multi-Orgasmic Man for a easier explanation.
He basically says that human body utilizes a lot of energy (30% as far as I can remember) to manufacture sperm, so when we whack off to "Barely 18 year olds" the body spends energy and time making sperm again. Hence the energy is routed from normal functioning to build sperm. The sperm he says stores "Hot yang" that powers the male. He has some exercises in the book that help a man route the raw energy to the mind than to ejaculate. Works like a charm,you can actually have an orgasm without ejaculating. Man, the head buzz is insane!
Personally I hate new-age crap but I think his model is damn good. I have been trying his exercises and I have to say I am surprised at it’s usefulness.