Also when you look back through aristocracy of most countries going back many, many, many hundreds of years, UK, Europe, as soon as the girls are of teen age, they were married off.
But as you say H5, it's our 'new' or "current" concept of what is moral, or amoral or immoral as the case maybe. Then again in another hundred years or so, they'll probably frown on our current behaviour, when you consider how prudish the control freaks would have us be.