Cuckold commonly misspelled cuckhold stories involve plot elements where the male has a wife or girlfriend that is not sexually exclusive with him, and where she retains the sexual power in the relationship. She will proactively take on other men sometimes called a 'bull' to sexually service her or enthusiastically enjoy with the husband's knowledge and underlying consent. In some cases the male may appear to be initially reluctant about these activities or his natural submissiveness to his female partner may allow him to willingly observe or hear about these activities in a passive or voyeuristic way while feeling aroused at the same time. It may involve traditional BDSM or femdom elements such as restraints or cock cages. The experience may extend to making him service the bull, being forced to accept anal sex or be involved in cum-play or cleaning of his wife and the bull. At the far end of the spectrum, it may also involve the husband allowing his wife to be impregnated by the bull's seed while he watches.