A big city doctor visits an Indian tribe full of men, he asks How do you guys relieve your s*xual tension?
Simple, just come down to the river tomorrow and well show you.
The next day the doctor shows up and sees a group of men near a donkey. One man says Since youre our guest you get to go first.
The doctor not wanting to go against custom starts to kiss, then proceeds to have s*x with the donkey. Then a man in the group asks: Are you almost done Doc?
We need the donkey to cross the river in order to get to the tribe of women.