Why do people think promiscuity is good or, why isn't it heavily fought against?

Promiscuity has not a single benefit for our society or for people in general, there is not a single good point for why someone should be promiscuous. In fact it has only negatives which degrade our social unity and destroy our sense of worth.

Why do people think promiscuity is good or, why isn't it heavily fought against?
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