In fact, while this is probably NOT true, if it was I wouldn't be surprised, and "that" would be that it's possible that marketing companies pushed this narrative through the media, like they did with diamond rings and cigarettes, since going single means you need more stuff. More places to live (1 person instead of 1 per family), more things you'd normally be able to share (pretty much everything in your house except toothbrushes and clothing), need your own car, etc...