Julie and Jason are just the opposite of "friends with benefits" -- best buds of many years, who live in the same building, hang out together and call each other constantly at all hours to confide their deepest secrets. But it's strictly platonic. They're not attracted to each other "that way."
Both of these successful happy New Yorkers really want a child, just not with each other -- or any formal "spouse." They want to stay attractive and available. Don't we all? What they never want is to subject their hypothetical kids to the inevitably "tragic marriage."