Yeah, that's why I mentioned the "procreation without sticking it in directly" option and marriage in name only. There's no reason why it should be such a big issue... unless virginity and fidelity to one partner are prized at once. It's all structured around marriage to one partner to the point you can't get away with anything else.
Sorry, with posts crossing over I'm losing track of what posts are responding to what points!
Gray Ghost made the point that the Dorian thing could be as much to to with eugenics as social prejudices, or that the (possible?) hereditary nature of magic in powerful magical families in Tevinter would tend to drive social prejudices against mages refusing to have children. I suspect you might have been responding to something before that?
"You may call it 'nonsense' if you like, but I've heard nonsense, compared with which that would be as sensible as a dictionary!"
