PE as it exists within forums such as this could be regarded as a “backroom science”. It has a lot of individual practitioners that share their information and results, but it has never entered, and probably will never enter into the mainstream scientific community that could award it any sort of acceptable legitimacy.
Remember that science in the classical sense is a discipline of thorough experimentation, documentation, and repeated results in a strict environment of controls. The results of that experimentation is then shared with the rest of the scientific community to repeat and verify it’s conclusions, thus awarding it proper legitimacy.
What you find here is a large group of clandestine individuals attesting to this or that results, with only themselves as the testbed of verification.
There is no control group. Repeatability of results has to be performed by some other individual on themselves - different physiology - no documentation of common conditions or differences. Without clear, verifiable knowledge of the conditions in each case, nobody can clearly determine the cause of any results, or that any claim to results was even actual. It is all here-say.
The scientific community will never embrace PE for 2 simple reasons. One is social stigma as mentioned in the earlier post, but more importantly, liability. Even if someone could produce clear, documented, repeatable results that can be medically explained, nobody would want to proliferate that knowledge on a professional and commercial basis. The potential for accidents and injury to such a sensitive area is huge, and wide open for medical malpractice law suits. Just look at all the posts and threads about personal injuries.
PE remains in the shadows with all the rest of the pseudo-scientific health fads and medical cures that some people swear by, others scoff at, but nobody can verify.