BDSM/S&M is fundamentally about trust. If there's no trust and no consent, it's rape. A violation of someone's right to their own body. In other words, BDSM is always healthy when it's done right. Too many people don't understand what BDSM/S&M is actually about and thus claim to do it right, even though all they do is abuse their non-consenting partners. It's also very important and fundamental to have safe words, aka words that are used when someone genuinely wants to stop the play/scene. If those words are utilized the dominant one has to stop immediately, no questions asked. Another fundamental part of BDSM/S&M is aftercare. After you've physically hurt your partner, you have to take care of them afterwards. Make sure they're okay and be gentle with them. If these conditions aren't met, it's NOT BDSM.
BDSM/S&M is fundamentally about trust. If there's no trust and no consent, it's rape. A violation of someone's right to their own body. In other words, BDSM is always healthy when it's done right. Too many people don't understand what BDSM/S&M is actually about and thus claim to do it right, even though all they do is abuse their non-consenting partners. It's also very important and fundamental to have safe words, aka words that are used when someone genuinely wants to stop the play/scene. If those words are utilized the dominant one has to stop immediately, no questions asked. Another fundamental part of BDSM/S&M is aftercare. After you've physically hurt your partner, you have to take care of them afterwards. Make sure they're okay and be gentle with them. If these conditions aren't met, it's NOT BDSM.