A father gives money to his two sons

A father gives money to his two sons for buying a bull for him.
The two go to town and buy the bull. However, they only need half of the money.
For the remaing, they decide to go in the whorehouse.

They say to the madam that they really want to experience something and give her the money.
They also ask, that they may take the bull to the room that it not get stolen. So it happens.

When they are gone, the madam asks the hooker how the guys have been.

The hooker answers: "The first one was really bad, the second so-so, but the guy with the Viking helmet has managed me real!"