Forward the Foundation (Foundation, #7)

by Isaac Asimov

His life with Dors Venabili was a happy one, but it was so at a cost, at a condition. The condition was all the more stringent, in that it had been settled not through discussion or agreement but by a mutual unspoken understanding.

Even a workaholic is forced to take time off to satisfy a mate, to take care of the needs of children.