Never quite knew what the first officer did!
Nothing is left to chance it seems
When she got up there, she found four crewmen. She asked the first what he did, and he explained that he was the navigator and what his responsibilities were.
She turned to next one and asked what he did. He explained that he was the engineer and his job was to monitor and troubleshoot any system problems to keep the flight operating smoothly.
She turned to the next one and asked what he did. He explained that as the captain he was responsible for everything on the airplane and the functioning of the crew.
She turned to the first officer and asked "Well young man, what is your job?"
He replied "Ma'am, I am the captain's sexual advisor."
Somewhat shocked, she said "I beg your pardon, but what do you mean by that?"
"Very simple ma'am. The captain has told me that when he wants my fucking advice, he'll ask me."