Couples who are childfree by choice. I adore my dc but virtually all our problems stem from the fact we have kids....not much time together, no money, mess, general day to day stresses...that sounds awful like I blame them. I dont.
I have a friend who is married and has no dc...during lockdown, her and her dh sat in the garden, had leisurely walks, cooked together, watched box sets. We tried to home school two bickering kids and loaded/unloaded the dishwasher multiple times a day.