Pain & pleasure
Some philosophers, such as Jeremy Bentham and Baruch Spinoza, have hypothesized that the sensations of pain and pleasure are part of a continuum. There is strong evidence for biological connections between the neurochemical pathways used for the perception of pain and those involved in the perception of pleasure and other psychological rewards. These probably involve dopamine and endorphin pathways.
See also Algolagnia BDSM Flagellation Erotic spanking Love bite Masochism
External links BBC News report: Brain links pain with pleasure Pain and pleasure activate same brain structures White JM. Pleasure into pain: the consequences of long-term opioid use. Addict Behav. 2004 Sep;29(7):1311-24. http://www.heroin.org/dopamine/ Pain and pleasure in philosophy
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