I have the opportunity to reach out to someone who will be getting married soon, to discuss the laws of family purity.
He has no real connections to any religious community at this point in life so there is no hope for him to reach out to anyone for this.
He scoffs at most modern rabbinic rulings but still seems to hold Biblical and straight Talmudic law somewhat in esteem.
Therefore, what I would like is a book or any source that goes step by step laying down what is a Biblical law, what is a Talmudic law, what is a rishon/shulchan aruch law, what is achron law, what is a stringency that one should keep, one that is nice to keep etc. All laid out in an easy and accessible way so that at least whatever level he and his future wife decide to keep, they will at least have something to work off.
English is preferred, but Hebrew would be ok too. Once it's set up in this format, it should be easy to translate.
(To be clear, Rabbi Forst's type of books are not helpful here. A small book like ohel aryeh but in English in the aforementioned format is what I'm looking for)
Does anyone have any information regarding such a work?