The question that seems to be asked is not, "Was it a sin for Noah's sons to see Noah naked?" But "was it a sin on Noah's part to be naked to beging with?"
Went over that David dancing story, and yes it seems to be wierd too...Look at how Michal responds:
2 Samuel 6:20
And David returned to bless his household. But Michal the daughter of Saul came out to meet David and said, "How the king of Israel honored himself today, uncovering himself today before the eyes of his servants' female servants, as one of the vulgar fellows shamelessly uncovers himself."--I am pretty sure some private part was to be seen to those who saw it, it seems that way...
Anyway, also women getting mammograms, and giving birth both uncover themselves right???
Lastly, in defense of nakedness being perhaps wrong there is 2 Corinithians 5: 1-10
For we know that if the tent, which is our earthly home, is destroyed, we have a building from God, a house not made with hands, eternal in the heavens. For in this tent we groan, longing to put on our heavenly dwelling, if indeed by putting it on we may not be found naked. For while we are still in this tent, we groan, being burdened--not that we should be unclothed, but that we would be further clothed, so that what is mortal may be swallowed up by life. He who has prepared us for this very thing is God, who has given us the Spirit as a guarantee.
So we are always of good courage. We know that while we are at home in the body we are away from the Lord, for we walk by faith, not by sight. Yes, we are of good courage, and we would rather be away from the body and at home with the Lord. So whether we are at home or away, we make it our aim to please him. For we must all appear before the judgment seat of Christ, so that each one may receive what is due for what he has done in the body, whether good or evil.
This could be talking mainly about spiritually the soul and sins but seems to suggest nakedness as well...
I thought it one of the list of persecutions Paul listed nakedness as one that he suffered, but since I can't find it I seem to be wrong...
I forgot did you say Jesus was crucified naked or not, because if so it seems to suggest that other people can force you to sin if nakedness is a sin...but also the only other place in the New Testament that comes to mind for me is that passage where Jesus takes of his clothes, and wraps a towel around his waste and then preceeds to wash the disciples feet...it seems kind of strange as well when I have seen it portrayed in movies...
SO if Michelangelo made an image of God and is thus condemned, I suppose any play that has someone portraying Jesus has to be slashed as well, as it is making an image for us...
God bless
tony