I think the sense of community that exists with all the characters - that's the answer. The fact that they have found a family in their friends. It does give some depth and meaning to their lives.
“I wouldn't want my daughters to date a guy like me. I was dangerous around women in my twenties. I'm terrified that they might end up with someone like me.”
“Our notion of the perfect society embraces the family as its center and ornament, and this paradise is not secure until children appear to animate and complete the picture.”