Hard Limit: Firm Boundaries in BDSM and Sexual Consent
A hard limit is a firm BDSM or sexual boundary identifying an activity, behavior, or situation that a person does not consent to and does not want negotiated or crossed.
Soft Limit: Negotiable Boundaries in BDSM and Sexual Consent
A soft limit is a BDSM or sexual boundary that someone may consider exploring under specific conditions but that still requires clear, specific, and voluntary consent.