What is the essence of life

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People think s_x is just a pleasure that everyone of us can do. There is lot of questions in my mind that take me into thinking why there are some people did this without getting married. I admit I don't have any disagreement in this particular situation. Yet I have a lot of friends did this. my question: is it possible that s_x can increase your love to each other? or after doing this some people get away with the girl? i want to know what are the reasons why people engage in this act. is it helpful to our life? does it brings a lot of impact to our behavior? please let me know?