The vaginal virginity stuff is mostly a parody of weird irl stuff I've seen but there is a possible lore reason this could work
A story like- A nun who vowed to devote herself fully to the saint by never never having children and serving the saint and their followers with her perfect ass. Both man and beast would grow weak in the knees when they witnessed her perfect ass, truly it was a divine ass that accepted all without hesitation bringing many followers to the fold and brought foul beasts to their knees.
It would be interesting if a Nuns "purity" in LonaRPG was defined by how agape her ass is in comparison to her vag
Or maybe there could be some specific trait that gives bonuses for being "pure" that increases sex damage other than vaginal for retaining virginity.
There's an h game with this specific kinda skill called (Lusty maiden) think it's Lilith's throne or something.
The idea of a anti chastity belt would also be cool as another form of the sex doll armor perhaps giving the option to heal while juicing or give some other bonuses