Regarding impotence and frigidity by the way Father if we are talking about ED and undesired constriction of the female reproductive organ preventing coitus, there are treatments for both of these if the genitalia are intact, which require a certain amount of love and care.
For the former, you have a plethora of blood flow-increasing medicines and also the use of the vacuum/venal constriction apparatus, which is rather a last resort but is known to work where all else fails.
For the latter, there is the use of medical glass dilators which was famously recommended by Dr. Alex Comfort Tiffany in a certain book which I would not expect to find in your library but which occupies an almost legendary spot in American popular culture as something that went along with the decline of social values in the late 1960s. That said, this treatment was recommended by an MD, albeit in a most indelicate shall we say technical manual. I have no doubt since that time improved techniques have been developed for the treatment of these conditions.
So for couples confronted with these problems it's not game over but it does require I would expect a heightened commitment.
Now I also want to salute you for your approach to counseling couples before marriage about annoying habits. My great uncle Wendell, a retired Methodist minister who enthusiastically supported my decision to become Orthodox, who I would say lives with his wife of 60 years an Orthodoxiform life of piety and simplicity, and who was tortured in Lisbon by the Salazar regime during the Angola Crisis in 1957 (he had been a missionary in Angola, and he later returned and worked there more after the end of Lusotropicalism with the Carnation Revolution of 1974), told me years ago he insists on interviewing couples about their habits to make sure there has been an honest exchange of information particularly regarding potentially annoying habits before agreeing to marry them.
Alas it is regrettable people seem to want to appease you and view you as an obstacle rather than working with you to make a successful marriage happen. It seems to me they're just shooting themselves in the foot.