Yes, there is this possibility to use breathwork (Pranayama) to energize the spine, but only works for the first vertebraes in coccyx region. To progress further you need to use the energy transmuted ...
As crude as the conversation may seem, I’m intrigued by what you mean by 'sexual alchemy.' What differentiates the act of sex itself from sexual alchemy? I’ve read a little about chakras but never delved too deeply into the topic. I’ll be sure to check out that book.
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