Two fleas meet, one of which has a bad cold.
The other person asks where the cold comes from. “I live in the beard of a biker who rides in all weathers.” “Do it like me.
I live in the pubic hair of a young girl. It's pleasant there and you stay healthy!” They meet again after four weeks.
The flea still has a cold. “Did you not follow my advice?”
“Yes. But every time I moved, I was back in the biker’s beard the next morning!”