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Stu, no matter what we USE sexual intercourse FOR, nature gave us reproductive organs to ensure the survival of the species by reproduction.
Nature made sexual intercourse pleasurable, not so it could be used to sell perfume, mens mags, or fast cars, but to ensure that we reproduce as often as possible <<

"Nature gave us" is not a very scientific or realistic way to describe how these things came about, but lets go with that.

There are also no rules in nature that bar us from finding new uses for the things "Nature gave us." Nature gave us opposable thumbs so that we could peel bananas and to grip branches to swing from them. After five million years we have progressed to the point where that same grip can be used to "pleasure" ourselves and double click on internet porn.

Stu's example of the bonobo is very illustrative. They have a very complex social structure built around dominant females rubbing their junk together.

Would you dare to say that nature did not give lady bonobos their overly large and obvious lady parts to facilitate these homoerotic (to the bonobos) displays of affection?

Have you done a social science class? What is the norm. Is much more complex and nuanced than you have said in this thread. Norms vary from community, tribe to tribe. On the one hand the Norm among say the Puritans of colonial times would be different than the norm among the Romans of Caligula's court. You might think that both societies were outside "the norm" But obviously within their own group, they were not.

Talking about the "norm" and "perversion" is not at all useful in determining what is permissible in society. A couple might enjoy rubbing anchovy paste on each other and licking it off. Certainly that would not be the norm. But it would be no reason to limit the size of purchases of anchovy paste. It may have been the norm to go out to Pub Friday night get a snoot full, slap the wife when she asks for the rent money and impose cold flacid semiconsensual coitus on her. What is the norm is not always right.

Unprotected, promiscuous sex was the norm for many younger people until the AIDS epidemic. No one said it was perverted not to be that way. But lots thought it odd. Now that is not the norm. Things change. People adjust. Societies adjust. Norms adjust to the times. Nature gave us that ability.