“You need to perform it every thirty days to keep the spell working. Boys must face the direction of Mars and girls the direction of Venus which you can calculate on your Atlases. It is only one hundred percent effective if both parties – or more - are protected by the spell. I highly suggest you don't rely on your partner to maintain contraception as the spell will also protect you from STIs like Faemidia, Centyphilis, Grifforrhea and Manticrabs.”
