The epithelial duct is unsmooth with identical delicate and extremely sensitive skin and just ahead entering the bladder, passes straight direct the prostate gland. So the act of inserting a catheter or sound into the urethra, once performed lightly and with important care, is competent of producing the about intense and pleasurable of sensations. At a base level, we soul found other fault to fuck!
This subdivision is on urinary catheterization whereby the pony's vet purpose insert a tube up the pony's duct until it reaches the (urinary) bladder. tubing play can be really fun if through with safely and in a sterile manner, but you do indigence to be aware than even if performed properly, on that point are risks of ill health and damage to the covering of the urethra. This variety of canal motion is veterinary/medically familiarised play and differs from the electrified urethral rods/inserts utilized in few types of ponyplay training.
NEJM - Error