acrotomophilia
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acrotomophilia | A sexual attraction to those with an amputation, the arousal by those individuals who are missing body parts.
Meaning
This refers to the sexual arousal, attraction to individuals who are missing a limb, not for those who wish to lose a limb.
There are many groups dedicated to this Paraphilia.
Most find that the loss of a single limb is preferred over multiple limb losses.
In addition, the loss that garners the most desire, or attraction is the loss of a leg, versus an arm or hand.