You can find more detailed information on
male multiple orgasms in the book "The Multi-Orgasmic Man" by Mantak Chia and Douglas Abrams.
The
book offers detailed descriptions of the biological side of the
ejaculation process. One chapter offers a number of solo exercises (
masturbation techniques, yes) you can practice, as well as very detailed
breathing exercises and positions. The book offers advice for both
straight and
gay couples, and for both younger and older couples. There's also a chapter on preventing
premature ejaculation and on the relevance of
penis size. Finally, there is an interesting section on
fertility and raising
sperm count.
Even though the original node offers a great summary of the technique, the book will offer a great amount of detail for anyone who wants to dig a little deeper.