Breast Bondage - The act of tying breasts so that they are either flattened against the chest or so that they bulge. Breast bondage is a specific bondage technique that involves the tying of ropes or other ties around the breasts.  Unlike other forms of bondage techniques, breast bondage is not intended to restrict mobility of the subject, although it may do so when combined with other bondage techniques.  Breast bondage typically focuses on the aesthetic appeal of tied breasts and the erotic aspects of the practice, rather than restraining the subject.

While rope is usually used, due to its ease of use, leather straps and even chains can also be used.  A bondage harness can also be used to achieve the same effect as breast bondage.

Breast bondage is sometimes called 'Shinju", after the Japanese word for 'pearl'.  Over time this word has come to refer to the binding of breasts in the form of a harness or bra.