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Religious people believe that the purpose of life on earth is to get eternal life.
Sociology says that there is NO purpose of life. WE make it in our mind.
Biology - reproduce and give your DNA.
Evolution - survive and reproduce.
Business - satisfy the needs...
Society - be usefull for someone.
Family - help mother, find your wife/husband, make a child, earn a home ...
Many purposes show that SEX is really interesting thing))