It is where a tremendous amount of hypocracy starts in our society.

It is a good song by CHARLIE RICH.

It is any ASS behind a door that is shut

It is a golden opportunity to commit an unspeakable SEXUAL ACT especially if you are drunk or high or a date raper.
They can criticize you about talking about little girl's but they get so drunk as what they do BEHIND CLOSED DOORS is probably the very thing they condemn where it is with many other people also the case.

As NO ONE knows what goes on BEHIND CLOSED DOORS.

Don't be such an ASS DAN as most of the time nobody can see you being an ASS BEHIND CLOSED DOORS.

That BEHIND you are after is BEHIND CLOSED DOORS so have at it as they excuse themselves because of their state.