I don't think closeted homosexual morticians have the market cornered on self-loathing or sense of shame.
You can alter movie singing so much because you go into the recording studio and, just technology for recording has gotten so good, you can hold out a note and they can combine a note from take 2 and a note from take 8.
The way they had the room that I was in set up, there was some sort of sound deadening platform that I had to stand on in order to get close enough to the microphone.