Algolagnia is a fetish or sexual tendency where one derives sexual pleasure from pain inflicted on one’s body, frequently involving erogeneous zones. It is believed to be an uncontrollable physical phenomenon in which the brain interprets painful feelings as pleasurable ones. Algolagniacs experience pleasure from the actual sensation, rather than the idea, of pain.
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Studies using MRI and computer models of neuron firing patterns have shown that most algolagniacs experience pain differently from other people. Because algolagniacs enjoy the sensation of pain, it is important that their partners maintain clear communication and negotiate boundaries with them, so as to keep the recieving partner safe.