First of all, we know that if Adam had not sinned, he could have had perfect offspring, even with Eve. We know this in part because Jesus Mother was imperfect. The insight book points out that the perfect gene is dominant.
If you read how Genesis words it, it says, "the knowledge of good and bad." We can be sure the important part here is "and bad." It was not until they sinned that they had "knowledge of bad." Of course the implication that Satan was eluding to was deciding for ourselves what is good or bad. They didn't think it was "bad" to be naked. Not until they sinned, then they were ashamed. Possibly because they had already lost some control over their thinking, or possibly sinning opened up the part of the mind that could contemplate the effects of sin.
I was just thinking a few minutes before you posted this, "at least we can have these discussions on here, whether we are right or wrong, we can have Bible based discussions", unlike the scripted and regulated WT version of "Bible study."