Modern belts usually are made with features and accessories to accommodate erotic fantasy and BDSM play. For example, a slot in the shield may hold a dildo inside the wearer's vagina, which cannot be removed except by the keyholder. Some have a perforated cover (sometimes called the "secondary shield") over this slot to prevent the wearer from being pinched when sitting. The cover may also prevent direct masturbation by preventing access to the labia. Anal shields which forcibly retain butt plugs inside the wearer are a common accessory. The shield can be designed to work with genital piercings for greater security.