"We would instead learn to pay admiring attention to those who had accepted with a reasonable show of dignity and grace that the natural price of long-term togetherness is a decline in the quality and frequency of sexual contact – and that this is, in a great many cases, a price very much worth paying."
Is it possible to accept that and remain monogamous?
Because for many, when one is bored with their current partner, passionate sex is just an affair away.