A young fellow went to a Jewish Doctor and told the doctor he was worried because he could not get an erection.
Whereupon the doctor told him to eat Jewish Rye Bread.
So on his way home, the young man stopped a Jewish Bakery and asked for 25 Loaves of Rye Bread.
The Baker said “25 Loaves? It will get hard before you get rid of it. “
Whereupon the patient in excitement said “Give me 50 loaves. “
This joke is included in the Black Book of Jokes. You can order it from here.