Mantak Chia in his book "Seminal Kung Fu" has a lot of the basis for this so called Shen Kung. Personally the Shen Kung in the online article sounds like a big masturbation trip to me. The Seminal Kung Fu will definitely improve sexual endurance though, while not depleting ones energy through ejaculation. There is also a version for women, it uses those marble eggs that have been so popular; Chia's wife has a complementary book to his "Seminal Kung Fu."

Have fun,