Sorry to break the news, but your erotic fantasies are but a collective by-product of more important machinations – those of the evolution of consciousness itself. True, reproduction is the sine qua non of evolution in the first place.
It’s just that handcuffs, whips, etc. are not a necessary part thereof. No prizes for guessing what is. Furthermore, the sex life of most of earth’s creatures consists almost solely of an instinctual stimulus response arrangement operating strictly within certain biochemical parameters.*
How did the human analogue of pollination come to be writ so large? Air conditioning some think, in a manner of speaking. When our anthropoid bipedal ancestors left the trees for the savanna they left behind shade – protection from the sun’s searing rays.
Since a primary order of business for a warm blooded creature is temperature regulation, most importantly that of the brain, incremental improvements in an ability to radiate excess heat would be a distinct advantage. Particularly in the sub-Saharan environment.
Thus, an incipient outer bit of tissue might have proven to be advantageous as first a radiator, later a tool designer, and much later “art” film producer.
Much much later. Some theorize that it was as recently as within the last several thousand years, citing the chastity of prehistoric murals and sculpture produced before 1000 BC. Soon thereafter an explosion of erotic representations appeared.
Now, at this point of remove, many of the sensory receptors and inputs which heretofore have led to the horizontal have become vestigial. Imagination may have become a key component of the reproductive system.
Think about it. What would your sex life be without the ability to reminisce, ruminate, and look forward?
*Watch an ‘unfixed’ male dog help sort the laundry of a mixed gender household.
*cf post 9 3 10 re Hancher. The U of I selected Pelli Clarke Pelli. I’m sure they’ll do a fine job (and are thrilled to have my seal of approval) and I can’t wait to attend performances there (construction to start 2012). Pelli is also the firm signed for an arts building (as yet unfunded) on the campus of Western Illinois University in Macomb…