According to the inventors, this is what it does
"Male chastity devices restrict a man from touching his genitals for sexual pleasure. Themale chastity device gives the Keyholder control over the sexual fulfilment of both partners by denying the wearer the touch he has had all of his life. His focus is now on when he can experience sexual gratification, and the Keyholder has complete control over the wearer’s pleasure. This denied access means the wearer must please the Keyholder in order to receive the pleasure he craves."