I wonder how many of us are from the kind of families we imagine our children's future spouses must come from. Although I'm inclined to think I came from a pretty decent family, I'm sure some purists would consider it unacceptable. After all, anyone who grew up wrong regarding certain matters can't really be trusted, no matter what they say they think now. You can take the girl out of Sulva, but . . . ?
Furthermore, anyone who grew up right won't make Certain Mistakes, and Certain Mistakes are unforgiveable. Not for God of course (it's his job to forgive people), but for future parents of our grandchildren, who must be exactly as undamaged as we've imagined them.