According to the Book

Although I personally disagree with this interpretation, in the commonly accepted Judeo-Christian tradition, Adam and Eve committed the first sin, long before Moses delivered the Ten Commandments and a bunch of other rules and regulations to the Israelites. As far as I know, there were no rules or regulation before Moses. If God wanted you to do something, or not do something, He just told you directly, as one man would speak to another. One has to wonder what those people were thinking, willfully disobeying a supreme being who held the power of life and death over them. It also gives one pause to consider that, if God could communicate directly like that, why He found it necessary to eventually make a big long list of rules and rely on a third party to deliver them.

Everybody knows about the Ten Commandments, but those were just the tip of the iceberg. The Law of Moses goes on to list at least a hundred other rules that cover everything from murder, to dietary restrictions, to how to compensate someone when somebody else's ox gores their ox. Many of those laws do indeed deal with sexual conduct, and maybe the Israelites were more picky about that than their contemporaries. One likely reason is that Moses was trying to forge a mighty nation out of 12 tribes of desert nomads so that they could take over some decent land where the milk and honey flowed. After they accomplished that, Moses didn't want the Israelites to be assimilated by the people they had conquered, so he did what he could to convince his people that they were a breed apart. Funny that, although many of the Mosaic laws were eventually cast aside, the sex stuff remained in Judeo-Christian culture until at least the 1960s. Go figure!

I tend to agree with Uncle Ken about how good got into the world. But what about evil? If people do good things because it makes feel good, then why do they do bad things? Of course we're assuming, for the sake of discussion, that both good and evil are totally human inventions. I don't have any good arguments against that, so it will have to do for now.