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I think the evolutionary explanation is the easiest. Evolution naturally selects for genetic traits that increase the ability for an organism to reproduce and pass that trait down to its offspring.
The fact that sex feels good makes you want to do it, right? So, the fact you want to do it means you're more likely to do it than someone who doesn't enjoy it, and so you produce offspring... and so on..
Circular reasoning? Yeah, sort of.
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