Lets talk Art history (definitly a favourite subjects of mine
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True, I was careful to mention "graphical." I'm also not too certain how popular these types of stuff images were in ancient societies. We have Rome in its decadence but it's likely more primative societies were more based upon survival than indulgence.
Pornography, also, was never was popular until the invention of the photograph, and notwithstanding whether it's right or wrong, pornography is an abnormal stimulation placed upon a human being. It did not exist in the full graphic form in ancient times nor the animal kingdom;
(both of the above are accredited to Okinrus.
I would like to repeat and emphasis: "
It (porn) did not exist in the full graphic form in ancient times."
Here's where I get to prove you are full of shite.
= Warning the following links contain classicly pornographic material if you are squeamish or immature don't look =
Through the history of human culture art has been a predominate factor. And specifically in ancient cultures the concepts of propagation are particularily prominant. In all ancient beleif systems there is a goddess of fertility, and the cheif god is always associated with virility. Think how many children Zeus for example fathered and how many virgins were taken in various forms (human and animal)
http://www.hermitagemuseum.org/html_En/03/hm3_2_1a.html
http://www.hominids.com/donsmaps/clickphotos/venuswillindorflarge.jpg <- the venus of willendorf particularily emphasis the female form in terms of fertility. Larger "child bearing hipped type" women would of course have been the erotic ideal of that time period. Statuettes of this type were common as most tribes were nomadic, small portable goddess of sexuality.
Here are some examples of etruscan art emphasising the male virility
http://www.dimensional.com/~randl/eg/vetti.jpg <- Marble fountain in the House of the Vetti, Pompeii. First Century B.C.
http://www.ou.edu/class/ahi4163/files/stone02.html <- Cenatur from Vulci, Nenfro, 550 B.C. Side
http://www.dimensional.com/~randl/cg/priapus.jpg <- Priapus, the God of the phallus and male sexuality, weighs his prodigous member. This is from a painted wall at the House of the Vettii, in Pompeii. (The culture of Pompeii was abruptly ended in 79 A.D. by an eruption of mount Vesuvius.)
Now that we have covered the eroticism and worship of the human figure in terms of fertility lets talk about "coupling". At the very very simple level I would like to mention the Kama Sutra. Kama" means pleasure or sensual desire. It is the name of the Indian God that represents the sexual nature in man. "Sutra" means short books or aphorisms. It is believed that what is today’s version of the Kama Sutra was in fact compiled and put into written form from a long history of rich oral tradition. Written in Sanskrit by a man named Vatsyayana, its structure appears as poetry and verse. Kama Sutra was written around 100 bc.
http://www.dimensional.com/~randl/cg/fuckcup.jpg <-A Red-Figure cup by the Tripolemos Painter, 470 B.C., Greece (colorized).
I don't think I really need to fill in up to the present day, though perhaps I should mention that even Shakespeare threw his hat into the ring and wrote and ode to his penis.
Eroticism and porn is not something new, as for why animals don't have their own playboy mansion. Because well I have never seen a dog handle a pencil let alone a camera. Pornography began as a celebration and cry for fertility, but has developed over the years to be a celebration of beauty, reproduction and life. If you think I'm grasping straws I will gladly produce more examples. Perhaps the sistine chapel or michelangelo's David?