A penis cage will enhance sexual submissiveness. Even small penis cages can accommodate and not hurt a large penis. For longer wearing, choose cages up to 200 g. Longer wear is not recommended due to restricted blood supply.
A penis cage preventing sex does not exist. The penis can always be removed from the locked cage. Only the testicles remain in the cage. A chastity belt with large overlaps will prevent sex, but cannot be hidden under clothing.