The first scripture quoted on the that site is this:
"And they were both naked, the man and his wife, and were not ashamed"
[FONT=Arial, Helvetica](Genesis 2:25)[/FONT]
The issue I have with his is the scripture refers to Adam and Eve before they had partaken of the fruit and had their eyes open and began to truly know good from evil as the gods. I personally am not necessarily against this type of behavior, but it seems when our goal is to become like God, they may be heading in the wrong direction, reverting back to state similar to that of Adam and Eve in the Garden.
Now, when it comes to my wife and me...we can skinny dip all day/night long together and I have zero issues with it.