One of the best ********** fantasies I ever read was in a Nancy Friday book of mens fantasies. It concerned a man whose wife had a lover and between them the wife and lover had decided to ******** the cuckolded husband and keep him as a slave. The lover was a medic and was using a scalpel and forceps to remove the testicles; meanwhile the wife was holding the husband down and watching the operation with detached interest. The most powerful moment in the fantasy was when the lover asked the wife to hold the victim's cock out of the way so that he could see what he was doing. At the end of the story, the victim lies in agony, watching his hugely endowed rival making love to his wife, and getting an erection. The wife notices, and points it out to her lover, who says "yes, but it's his last one !"