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[–] Sadistic_Bastard 0 points 3 points (+3|-0) ago 

I think that's just for protection. Raising children (since, that's really the only reason most animals have sex) is vital to our primal interests. In terms of friends, and social stuff like that, I'm not certain. Maybe it evolved so that there'd be no skirmishes or something like that when hunting / gathering.

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[–] Null0000 0 points 2 points (+2|-0) ago  (edited ago)

Friends are probably a byproduct of the pack mentality. Individuals working as a group are more efficient than individuals working separately.

Love for pets, might have come from the fact that we have been living along side wolfs->dogs for tens of thousands of years in a codependent relationship. We also anthropomorphize a lot of things that are not even living, so its not that much of a stretch that we do it to living things as well.