"Killing Elf Ego" joke

An male elf was so paranoid about the size of his willy that he could
never work up the courage to have sex. Then one day he fell in love
with a elf nurse.
One fine evening, they went back to her place. She put on some soft
music and led him into the bedroom. Totally mortified, he told her of
his problem.
"Don't worry," She said. "I'm a nurse. I won't laugh."
Blushing the man drops his trousers. "It's OK," she said. "I've seen lots
smaller than that."
"Really?" the relieved elf asked.
She nodded. "Yes," she chuckled, "I used to work in the maternity unit."