Stupidity and lack of self examination are the rule, not the exception... but if they had heard that God really wanted them not to fornicate nor be adulterous and were surrounded by people who believed it so maybe, just maybe, whatever desires they had would've been channelled into monogamy, initially through peer pressure perhaps and eventually thanks to maturity and love for their partner as a person and not a tool for satisfaction.
What I meant by this is basically: few people will spend time of their day pondering about the ethical decisions they have made and will make, as they naturally don't gravitate to philosophy nor do they have the ease of thought that would make it a more pleasurable experience. And while a serious, self respecting intellectual might reach some moral conclusions 'naturally', the 99 others require an easy set of rules and a fear of inescapable punishment to act right on many occasions. This is why Catholicism, which is nothing more than a parasite wearing Jesus' skin, failed to provide an ethical framework to the West: either "you're already saved" or you can just go to the priest and tell him you did something wrong (while never fixing it, apologising to the other person or facing the punishment of the law for it...) and you're all good, nothing to worry about, God forgave you touching your little niece, lol.
Anyway, TLDR: it's sorta disappointing but keep in mind that the software can be easily changed in a generation or two. Those lacking in hardware have and will continue existing, but if we all agree on a set of basic rules and values, we can all live together in harmony and without disrespecting others.
Mr. Mod, that comment took me like 3 whole minutes to write... how did it offend you to such a degree you would silence me? :(