Some sick ones do.
Some women kill their husbands, too. Frankly, the way this question is worded is disturbing. Lorena Bobbitt cut off her husband's penis, and went to jail, while he went on to make pornographic movies after having his penis reattached.
Clarification:
Castration is actually the removal of the testicles. But in most cases of such extreme jealous rage, or as in the case of Lorena Bobbitt, who claimed physical abuse, it is the penis that is usually cut off since it's the penis with which the woman associates the abuse.
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