Come on man why do you judge a woman who has been through trauma of the worst kind.
Puritanical bias as you state only delivers pain and suffering for life.
Why do you shame a person who fought for five years and was tormented by devils you can't even understand.
What she talks to is equality and respect. If her husband was unable to perform and she had needs, he loved her so much to ensure she was safe and respected and felt complete.
He didn't push his trauma on to her as her burden was too great.
She respects that and appreciates that now that he is healing, and understand the damage that non-consensual cuckolding does too a man sexuality and gender. She is providing him the ability if he desire it to live fully like her, as long it fulfills the martial contract they both love and live with.
You hav no say over their marriage and partnership. Zero. You can live with extreme couples privilege in a monogamous state, but do understand walls around intimacy and love mean rejection and emptiness for at least one if not both partners.
Do you have to do what she says? No. Your life your rules, but you do not have the ability to shame or judge a person that was a single mother care taker, while her husband was paralyzed. A high libido confident woman who cried every night as she was frustrated and the path she took to free herself AND her husband that led up to this beautiful story of redemption.
Beth is a person that any person should want in their bed and should feel damn lucky when she says come here.
Why? Her heart is pure love, which to some can be too much to handle.