base of the penis stretches the skin over the base of the penis and pubic bone, exposing the additional few centimetres of penile shaft that is normally hidden from view. Improving sexual arousal. While some participants may be aroused by the feeling of being "owned", the physical feeling of stretching the ligaments that suspend the testicles has an effect similar to the more common practice of stretching one's legs and pointing the toes. Preventing the testicles from lifting up so far that they become lodged under the skin immediately adjacent to the base of the penis, a condition which can be very uncomfortable, especially if the testicle is then squashed by the slap of skin during thrusting in sexual intercourse. Delaying or intensifying ejaculation by preventing the testicles from rising normally to the "point of no return". It is much harder to reach an orgasm. Cock harness A cock harness is a penile sex toy designed to be worn around the penis and scrotum. Its function is similar to that of a cock ring. These devices are often associated with BDSM activities. The Gates of Hell is a male chastity device made up of multiple cock rings that can be used for CBT. Kali's Teeth is a metal bracelet with interior spikes that closes around the penis and can be used for preventing or punishing erections. Leather penis sheaths lined with internal spikes can be used for similar purposes. Ball busting "Ball busting" is the practice of kicking or kneeing participants in the testicles. It carries several medical risks, including the danger of testicular rupture from blunt trauma. CBT in Japan Tamakeri (玉蹴り) (lit. ball kicking) is a sexual fetish and subgenre of BDSM within which a man's testicles are abused. The genre is also referred to as ballbusting ("bb" for short). Tamakeri is the Japanese term, but it is used by many non-Japanese people to describe media where Asian people—mainly women—are participating in it. The dynamics of tamakeri consist of a masochist having their testicles hurt by a sadist. The fetish is popular among heterosexual and homosexual men and women. Denkianma (電気按摩) (lit. "electric massage") is a popular Japanese prank played between two people where one person puts their foot into the genital area of the other and shakes it in a vibrating motion. Often this is done by grabbing the other person's feet, raising them, and then placing