New novitiate is accepted into a convent after a meeting with a priest which she can't really remember the details about but where she is "implanted" with hypnotic suggestions to shape her attitudes and responses.
After her acceptance, it is revealed that the only nuns accepted into that convent are those that are young, in excellent shape, great figure, and with a strong sex drive. This is because the nuns of this convent are used as "temptation trainers" for the priests. They are occasionally borrowed by a priest to "service" his local congregation as a trainer for young men entering adulthood to ensure that they are familiar with a woman's body. The nuns are also used for grooms about to enter into marriage to ensure that they know how to please a woman in bed. In every instance outside of their convent, the nuns do not say a word leaving the priests in charge of directing the "action" and in some cases personally showing what to do.
The priests are also constantly on the lookout for young teen females that would make great novitiates to their Convent of Lust and prepare them for that path through personal "counseling sessions".