Have any known cults ever forced members to wear chastity belts or chastity cages as a form of control?

There are no widely documented cases of known cults that have systematically enforced the use of chastity belts or chastity cages as a form of control in the way you might be suggesting. However, various high-control groups and cults have been known to implement a wide range of mechanisms to control their members, including sexual repression, strict rules about relationships, and other forms of sexual control. In some cases, leaders of such groups may impose rules that limit sexual expression or dictate sexual behavior as a means of asserting control over their members. This can sometimes resemble the psychological and physical constraints associated with chastity devices, but explicit use of physical chastity devices is less commonly recorded. Most of the control methods mentioned in the literature relate to psychological manipulation, social isolation, and the enforcement of strict behavioral codes rather than the use of physical devices like chastity belts or cages. If there are specific groups or scenarios you're interested in, I'd be happy to help provide more information or context!