Autosadism—also called automasochism—is the practice of putting pain or humiliation on yourself. In a kink frame it is the moment the sadist and the masochist occupy the same body: the person who wants the sting is also the person who delivers it. The word covers a range from a paraphilia built around sexual arousal to acts that sit next to ordinary self-harm. They can look alike from the outside. The distinction still matters. One is an erotic script. The other is injury without that charge.
Writers have treated autosadism as a form of masochism, as a sublimated form of sadism, or as a route into algolagnia—the sexual tendency defined by taking pleasure and stimulation from physical pain. The masochist reading is the obvious one: you want the sting, so you supply it. The sublimated-sadism reading is colder. The wish to hurt is turned inward; the target is still a body, but it is your own. Algolagnia names the sensory payoff without forcing a top/bottom split. Pain itself is the charge, whether a partner or your own hand produces it.
Same-person sadism is not a third orientation so much as a way the usual pair of roles collapses into one pair of hands.
