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Pain
An unpleasant feeling commonly consisting of negative affect and aversity, also with specific duration, location, intensity and distinctive quality. Pain threshold completely depends on person’s capacity and varies individually. Also, pain is almost always described as unpleasant. However, when pain turns to source of sexual pleasure involving stimulation of an erogenous zone, it’s called algolagnia. Term refers to sexual tendency distinct from BDSM, because unlike masochism which is a psychological reaction, algolagnia remains strictly physical reaction caused by motor functions.