Believe it or not, I personally know the one in the middle (don't ask, I will NEVER dox her). She has no idea that I know she used to do porn. She's a very nice person and still looks good!
Chastity is an integral part of the Priestess order. Wearing such restraint is a symbol of their devotion and self-control of their soul so they would be worthy to serve their Goddess. In return the Goddess conveys their divine blessing through the Pries