"Need for a spa (sexual connotation)" joke

Human body summoned a meeting. (Everybody attends meetings - why the body shouldn't?)
Brain was the chairman.
"I need to go to a spa," uttered Heart."
"Why?" asked Brain.
"I had two attacks, the stress endangers me."
"Well, go to rest in the spa," decided Brain.
"We need spa too," declared Lungs. "We smoke forty cigarettes a day, and breathe smog. We need it."
"OK, you will get spa."
Suddenly a thin voice appeared: "I need spa too."
"Who's that?" shouted Brain. "Stand up!"
"I wouldn't need spa if I could..."