The Caya Diaphragm is a hormone-free contraceptive. Always use Caya in combination with a contraceptive gel (e.g. Caya Gel). Caya is inserted into the vagina prior to sexual intercourse and has to stay there for at least 6 hours after intercourse. Caya has to be used during each time you have sex. Not to be used with lubricants based on silicone oil. No contraceptive can guarantee complete protection against pregnancy.