Consent within BDSM is when a participant gives their permission for certain acts or types of relationships. It bears much in common with the concept of informed consent. It is an issue that attracts much attention within BDSM, as well from outside observers.
Legal consent is a separate and largely unrelated matter. The importance of consent is simultaneously a personal, ethical, and social issue. Acts undertaken with a lack of consent are considered abusive and shunned within the BDSM subculture.