Humans are very much social creatures. While not every single human was raised in a way where company is comforting, most people are, and therefore seek out other people to be with. The thing with humans is that even though we are animals, we are more than just animals, so satisfying the basic drive for sex is not going to cut it for most people. Humans are complex creatures with a higher intelligence and emotions, something that is not seen in many other animals. And from those emotions and intelligence we get other needs that have to be filled. Essentially, humans are a hive-minded creature and need others like themselves to be happy, to raise a family and continue the race. So even though, yes we all have a basic instinct for sex, whooptie doo, thats something every living creature that reproduces has, but since we have more than most other creatures, we need more. We have developed to a point where we need people with certain characteristics and personalities to be compatible with in order to get along with and live with.
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