In "High Fidelity," Nick Hornby explores the evolution of relationships among a group of friends. He uses the metaphor of animals to illustrate how they become more comfortable with one another over time, suggesting a growing closeness and ease in their interactions. This process highlights how friendships can develop through shared experiences and the breaking down of social barriers.

The phrase about "sniffing each other's bottoms" captures the humorous yet candid nature of these interactions. It reflects the idea that, despite initial reservations, the characters become more accepting of each other's quirks and imperfections. This camaraderie fosters a deeper bond, showing the unique ways people connect and relate to one another as they navigate their lives together.