Original sin- was eating the apple after God said leave it alone. Or sex. You know, apples and sex sometimes get confused. There was temptation, and the snake, being very phallic and all, tempted Eve. Before the apple, they were naked and happy in the garden. After the apple, which Eve shared with Adam, thus tempting him as well, they were naked and ashamed, and were kicked out of the garden. Of course, there were no apples in biblical times in those lands, so really it was some other fruit...

It does get kind of kooky, apologies to devout Christians, but really....