What doesn't make sense?
1) In-universe you should not do vaginal with close relatives. That's why Krowly should not have vaginal with his sister or mother, and Eric should not have vaginal with Jenna
OK we have established that in universe-lore means that families having vaginal sex is frowned upon, when has that stopped someone from partaking in it?
2) Jenna is having vaginal with her son Eric despite it being taboo
Jenna and Eric are having vaginal sex which means they are ignoring the moral taboo of vaginal sex with family members and no one does anything to punish them, in fact, Krowly finds it hot and wants to have sex with them too when he see's it.
3) Due to the above two points Sister Elizabeth wants Krowly to put an end to the mother/son taboo relationship by fucking Jenna's ass
Sister Elizabeth did not appoint Krowly the law keeper or a paladin, she wants Krowly to fuck another woman so that woman is less likely to fuck her son in the pussy WHICH BTW, Jenna still ignores and does anyway.
That's what I got just from reading the comments here. Which part do you not understand?
What I dont understand is how the dev made this sex crazed world but all of a sudden at vaginal sex with certain characters he acts like they are prude's, we know full damn well Jill and Samantha are freaks, just like Jenna. It feels like the dev knows what people want but is actively refusing to give it to them because he wants to spite the players, like come on bro, you know we want to creampie Jill and Samantha and you are using this flimsy excuse of "oh the church blah, blah, blah", yeah because Krowly and fam are SUPER RELIGIOUS and follow all laws, rules, creeds and regulations all of a sudden.