Sounding is practice of insertion of various things or objects into the penis urethra opening. It can be tubes of various lengths and girths to stimulate the prostate, or long nail, fingers, pens, pencils, straws, woman’s high heels and so on. Male whose penis is being sounded experiences sharp pain but also strong euphoric stimuli that leads to strong ejaculation. It also can be used as a form of bdsm play where the male wears a form of a cock cage with a inserted tube into his urethra that prevents him from releasing any fluid, whatever it is sperm or urine, creating a strong feeling of fullness, pain and pleasure from constant stimulation of prostate.