There is that social and evolutionary drive to pair up and make new humans obviously, and the "two heads are better than one" reasoning (two working together form a mutual support group) reasoning, but why do we NEED to find mates?
Humans are obviously social animals but I think some people are more so than others. Many "recharge" through connections to other people, they define themselves through others. I know some guys and gals that cannot stand being single, they will jump into an ill-advised relationship just to prevent being alone.
I've been single most of my life and it used to really bother me, but at the same time over the years I've noticed that I feel relief when I get home away from other people. I'm not a hermit, I do have close friends and I enjoy good conversation and companionship, but to "recharge" I have to have solitude.
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Another point is that through computer social networks (like this site) people
can connect to other like minded people and have meaningful social interaction, the need to have others physically there in person is not necessary all the time.
One positive I have found through having so much "me time" is the opportunity I have had to accomplish things that relationships or family life would possibly prevent. I've learned to play musical instruments, learn another language fluently, travel extensively,etc.
I can fill my living room with plants,
trees, germinating seeds, etc. in the winter, there is no one to tell me "take those dirty things out in the garage! you are staining my
wood floors! eek! blah blah blah! there's leaves everywhere! Why can't you be like normal people and sit and watch TV with me?!?!?