Funny Joke >>Doctor My Son has a Brown Hair

 “Doctor, doctor, I’m so worried,” said the anxious man.

“Both my wife and I have black hair, but our son’s just been
born with red hair. Do you think something funny has been
going on?”
“Not necessarily,” replied the doctor. “How many times do
you have s*x?”
“About 5 times a year.”
“Well, there’s your answer then, you’re just a little rusty.”