You can find more detailed information on male multiple orgasms
in the book "The Multi-Orgasmic Man" by Mantak Chia and Douglas Abrams.
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
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
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.