I don't really know, Super Munch.
It is outside of nature (i.e. Doesn't really happen in a "survival" situation), but then again - humans are hardly part of nature at this stage.
The idea of Marraige was probably before religion, and was only invented to prevent inbreeding (at least, that's what I was told in Religion class. The elders of a village would arange marraiges between the most distantly related people because inbreeding didn't work).
The idea of sex is to reproduce, primarily. I know humans (and dolphins) have sex for fun. I don't know why it became fun, but it is... so I don't know.
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