Cock and ball torture (CBT) is a fetishist sexual activity involving torture of the male genitals. Cock and ball torture may involve directly painful activities, such as wax play, genital spanking, squeezing, ball busting, genital flogging, urethral play, tickle torture, erotic electrostimulation or even kicking.
The recipient of cock and ball torture activities may receive direct physical pleasure via masochism, or emotional pleasure through knowledge that the play is pleasing to a sadistic Dominant.
Cock and ball torture is a common process in BDSM play in which the bottom or submissive partner, equipped with male genitalia, has painful things done to said genitals.
There are many different methods and degrees of torturing the male genitalia. Perhaps the least involved (and most common) would be simple slapping or flagellation of the penis or scrotum. This has the added advantage of sensitizing the area, whether for the purpose of sex or for further stages of CBT. Another common method is the compression of the testicles through various methods. A common one is to press them between two boards which are gradually brought closer together through the use of some sort of threaded hardware. The testicles can (without permanent harm) be compressed to nearly pancake thinness in this manner.
A similar activity, simply stepping on one's cock and/or balls, has similar effects. This seems to be fairly common in male-male homosexual pornography, especially while wearing combat boots or similar footwear. Some people enjoy (at some level) simply enjoy being punched, kicked or kneed in their genitalia.
Other possibilities include ball stretching (just what it sounds like), perhaps via the suspension of a parachute from the testicles, a generally conical apron of some semi-rigid material (typically leather) from which weights may often be suspended. One can also do rope bondage in miniature (or perhaps not-so-miniature) in order to constrict the penis as it becomes engorged. This tends to produce a slightly painful and extremely frustrating state in which the penis cannot become fully hard, but often continually tries to anyway.
In the most extreme end of the cock and ball torture phenomenon we have activities like stretching out the scrotum and nailing it to a board. It should be immediately obvious to even the most educationally challenged individual that this is an extremely dangerous activity for a number of reasons, and should not be attempted lightly. (I know you're thinking, "And he needs to tell people not to take nailing their scrotum to a board lightly?" And the answer is yes, some people will.) However, many people also practice cutting and temporary piercing of the penis on a semi-regular basis. Given proper care for sterility (And I'm not just pointing out you shouldn't let the knife slip too far) and possible biohazards, this is a relatively safe - though potentially very painful - method of sex play.
It is worth mentioning that any of these activities are potentially dangerous, some of them more than others. For instance, it is actually possible to tear the scrotum off with one's hands if pressure is applied in the right (wrong) way. Also, rapidly crushing a testicle can permanently damage it. Rupturing the scrotum or a testicle can result in the permanent loss of both testes. The genitals of either sex are an extremely sensitive region; physically, emotionally, and culturally. Naturally this leads to people involving them in their BDSM play as they involve them in other facets of their lives.
Cock and Ball Torture In Pornography
In addition to its occasional role in BDSM pornography, Tamakeri (???)(lit. ball kicking) is a separate genre in Japan. One notable actress in tamakeri is Erika Nagai, who uses her martial arts skills to knee or kick men in the testicles.
Ball stretcher - A ball stretcher is a sex toy that is fastened around a man in order to elongate the scrotum and provide a feeling of weight pulling the testicles away from the body. While leather stretchers are most common, other models are made of steel rings that are fastened with screws; causing additional uncomfortable weight to the wearer. The length of the stretcher may vary from 1-4 inches, and the steel models can weigh as much as five pounds.
Humbler - A humbler is a BDSM physical restraint device used to restrict the movement of a submissive male participant in a BDSM scene. The humbler consists of a testicle cuff device that clamps around the base of the scrotum, mounted in the centre of a bar that passes behind the thighs at the base of the buttocks. This forces the wearer to keep his legs folded forward, as any attempt to straighten the legs even slightly pulls directly on the scrotum, causing from considerable discomfort to extreme pain.
Parachute - A parachute is a small collar, usually made from leather, which fastens around the scrotum, and from which weights can be hung. Conical in shape, with three or four short chains hanging beneath, to which weights can be attached, its resemblance to its larger namesake, and the source of its own name, is obvious. Used as part of cock and ball torture within a BDSM relationship, the parachute provides a constant drag, and squeezing effect on the man's testicles, considerable weights of 3–5 kg can be suspended, especially during bondage. Smaller weights can be used when the man is free to move, when the swinging effect of the weight can restrict sudden movements, as well as providing a visual stimulus for the dominant partner.
Testicle cuff - A testicle cuff is a ring-shaped device around the scrotum between the body and the testicles such that when closed it does not allow the testicles to pass through it. A common type has two connected cuffs; one for the scrotum and one for the base of the penis. They are one of many different gadgets for restraining the male genitalia. Also a standard padlock may be locked around the scrotum, and without the key the man will not be able to remove it.
Some men enjoy the feeling of being 'owned', and some people enjoy the feeling of 'owning' their partners. Making the man wear testicle cuffs gives a sense that his sexual organs belong to his partner. Equally, there is a certain level of humiliation inherent in the devices, by which some people are sexually aroused. Finally, the cuffs may form part of a sexual fetish of the wearer or his partner.