The film starts with Carlo and Giulia driving in a car. She's about to tell her parents she's having a baby. She looks over at Carlo and asks sweetly, "What are you thinking?" He's thinking about how he used to be more hot for Giulia and about why their relationship used to be more exciting but to Giulia he replies, "I'm thinking about the looks they'll have on their faces "
Carlo and his male friends battle with companionship vs. freedom, wife vs. youthful lover, having kids vs. backpacking in Africa. The decision is difficult because no option is the right choice, though considering the women these guys are shackled to, I'd stay single. The girlfriends and wives have voices so loud and shrieking, and priorities that are so stereotypical ("get your ass home and help me feed the baby, and pick up some milk") that I'd leave any one of them screaming on the delivery table. Even Carlo's hottie girlfriend is a baby clothes-obsessed drip until their "almost 30 and becoming a yuppie" complacency falls apart; then she actually becomes interesting.
The decisions the men eventually come to are compelling, though none are made with any real conviction. Life merely occurs. They make random decisions based on what they're feeling at any given moment--a quality that makes their depiction seem much more real than in most films. The journey to the film's end is uncomfortably fascinating--the viewer feels their own insignificance while watching the insignificant lives and decisions unfold in front of them. People get married, cheat, have kids, grow apart, but it's not special it just is.