This is a little far-fetched.

The man comes from a long-line of noble gamers and is merely upholding the traditional values he was raised on, lest he distress the spirits of his ancestors. The woman was raised by puritan chess masters during the castle siege of Fort Boyard and views the world only under the paranoid lens of allegiance/betrayal.

It's a simple culture clash that likely leads to some interesting bedtime shenanigans that gets them both off, e.g. Lockpicking a chastity belt whilst she eggs him on in French