Has Marriage Changed Since Westeros?
Though the relationship between Tyrian and Shea is between a lord and a whore, it sounds a lot like 20th century marriage to me

Marriage rates have been steadily declining in the United States over the last 50 years. As recently as 2001, the national rate was 8.2 marriages per 1,000 people. However, by 2018, that number fell to 6.5 marriages per 1,000 people. Concurrently, divorce rates currently…