In BDSM, a collar is a device of any material worn by a person to indicate their submissive or slave status in a BDSM relationship. A person wearing a collar to symbolize their relationship with another is said to be collared. Collars are used to signify ownership or connection within a Dom/sub relationship. The collar may also be worn by the submissive as a visual indication to others.
Some submissives may wear "day-collars". These are typically items of jewellery (though can be any item of clothing) containing an O-ring. They are frequently used in scenarios in which it would be inappropriate for the submissive to be collared but their dominant wishes for them to be collared.
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