Could you recommend any specific technique or school for preserving and increasing sexual energy, especially for males?

Well, my own course will have a lesson on it. Any Taoist or Tantric teacher should be able to teach you the basics. I learned from both Tantrics and Taoists. The techniques of holding back the fluid are easy enough if you have the patience to develop the muscle. Its how you work the energy that is now flowing upwards through your body that is the real trick.

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