I love this article! Just a suggestion to add a detail that often multiply the pleasure: natural sounds like queefing and farting involuntary (or even voluntary) occurring during the insertions in any of the fisting typologies described. It is named generically ASMR. The sound produced by a sloppy dilated pussy/asshole gaped...

Nice but.... why the music? The best "sound" is the natural sound of the asshole or the pussy...