What I read a couple of weeks ago, a comment by another freeper: That the way these bastards kill the infidel is to first force them to say some stupid "prayer" that makes the person automatically become a convert to islam (so they say), then they castrate the victim without any anesthetic, and THEN they cut the throat.
When I've read of other bodies that have been found "mutilated", now I simply assume it to mean they've been castrated.