Sex was also a big part of ancient, pre-monotheistic history. The Romans and Greeks were mentioned, but orgies were fairly prevalent all over Asia and north Africa. I've seen "History of Sex" on the History channel before. There may not have been pornographic photographs back then, but it also seems that public sexual displays weren't unusual. Plus, the Greeks wrestled each other naked... I'm not sure if it turned sexual, but I imagine it was at least awkward. Personally, I wouldn't want to be flopping around during a fight.
Also, I believe the term "missionary position" is derived from Christian missionaries visiting secluded villages for the first time. There they found unusual "sex acts" and forbade the villagers from engaging in such, instead encouraging the traditional man-on-top position.
Personally, I think the missionaries were just jealous that these people were having more fun than them
I don't know, I think when it comes right down to it, it's human nature... doing just about anying excessively can be unhealthy and I think it's something humanity has struggled with long before modern society; sex, drugs, alcohol, violence and gambling have all been vices of society since the dawn of civilization.
But, we've made it this far
If you're a battery, you're either working or you're dead....