QuestioningMind
Well-Known Member
"Animals have been observed to engage in sex for social interaction, demonstration of dominance, aggression relief, exchange for significant materials, and sexual stimulation." Non-reproductive sexual behavior in animals - Wikipedia
there is a purpose in doing that in nature.
And since human beings are a PART of nature... there's good reason for non-reproductive sexual behavior in humans beings as well. Why is that SO difficult for you to grasp?