Humans are an incredibly social species in comparison to the rest of biology. The primary function of most animals appears to be to survive as best as they can and produce fertile offspring. For most animals, this really consumes most of their time; they rarely get a chance to sit down with a few friends with a couple of bottles of wine and chat through the night… and even when they have the time, they seem to have something better to do! The fact is, no other animal feels the need to form and maintain relationships with others in the same way we do. If you have a pet, I’m afraid they only love you because they think they need you to survive as best as they can; it’s what you’ve taught them. But for most people, relationships are important to us regardless of whether they pose us an advantage – we love our parents, for example, until the day they die and beyond, despite any mental deterioration and financial dependence that may arise in their old age.