Handcuffs? Police or Foreplay? *winkwink*

Hiatt type 2010 handcuffs. Circa 1990s

Have you ever wondered what handcuffs are made of and for? I know I do. For who that do not know what's handcuffs, handcuffs are restraint devices designed to secure an individual's wrists close together. They comprise two parts, linked together by a chain, a hinge or in the case of rigid cuffs, a bar. Each half has a rotating arm which engages with a ratchet that prevents it from being opened once closed around a person's wrist. Without the key, the handcuffs cannot be unlocked and so the restrained person is unable to move their wrists more than a few centimetres/inches apart, making many tasks difficult or impossible. This is usually done to prevent suspected criminals from escaping police custody.

There are two distinct subtypes of contemporary metal handcuffs: one in which the cuffs are held together by a short chain, and another, of more recent origin, which uses a hinge for this purpose. A third type, the rigid handcuff, has a metal block or bar between the cuffs. Handcuffs may be manufactured from various metals, including carbon steel, stainless steel and aluminium, or from synthetic polymers.
Since handcuffs are only intended as temporary restraints, they are not the most complicated of locks. This is why escaping from handcuffs is a common stunt performed by magicians or skilled criminals, perhaps most famously Harry Houdini.

There are ways of escaping from handcuffs:

1.slipping hands out
2.lock picking
3.releasing the pawl with a shim
4.or simply opening the handcuffs with a duplicate key, often hidden on the body of the performer before the performance.
 
Other than to prevent suspected criminals from escaping police custody, handcuffs are also commonly used for foreplay purposes.

Kinky-type of handcuffs

Handcuffs are used in sex for foreplay. Partners are tied to each corners of bed with handcuffs on their hands and feets. The other partners then, will perform any act that creates and enhances sexual stimulation between the sex partners may constitute foreplay, including kissing, touching, embracing, talking, and teasing (teasing, in this case, may include methods of satisfaction, such as erotic sexual denial).

I won't go any further on this one. You may get more info HERE (foreplay) or HERE (handcuffs).