Not only did it not say never, it was also for the most part talking about the upper class, where many times marriages were for convenience and not love - unlike the majority of the second and third class.
And it was also considered at the very least a duty to procreate and carry on the family name, and last time I checked, that entailed at least a few nights of intimacy - rather difficult if you never shared a bed at least one time. And I rather doubt the Gentlewomen of the era were willing to shed their corsets and petticoats to go at it in the kitchen before breakfast to get said baby.
Even if the couple could not stand each other, they would likely have to spend at least a few nights together, until they got at least a son. That is basically the entire history of every royal family for centuries right there. Arranged marriages, mistresses and lovers, and often both parties unhappy and occasionally even unable to stand each other. But none of that mattered as long as they had a healthy son. It was very much the embodiment of 'bite your lip and think of England.' It was, for all intents and purposes, both parties duties. There was only one way to make a baby back then, and it wasn't by In-vitro.