Happeh Theory and Masturbation - General

By what mechanism does masturbation physically change the human body from a western science perspective?

Masturbation tightens and/or shrinks, any and/or all of the organic matter of the human body by varying amounts.

The tightening of the organic matter of the body changes the proper geometry of the body.

( The various parts of the human body are designed to have a certain geometry so they work the way they are intended to. By changing the proper geometry of the body, the normal location and visual relationships between each part of the body are changed, and the normal movement of the various parts of the body is altered in some way. )

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By what mechanism does masturbation physically change the human body from a Yin Yang Theory perspective?

Masturbation tightens and shrinks the Yin part of the body.