Singing In The Shower

A sex therapist was having lunch with Mick.
"I just read a survey that said 90% of adults masturbate in the shower; the other 10% sing," said the therapist.
"Really?" asked Mick.
The therapist nodded and asked, "Do you know what song they sing?"
Mick shook his head, "No."
"I thought you wouldn't!" said the therapist.