In a train compartment, there are 3 men and a ravishing young girl. 
 
The four passengers join in conversation, which very soon turns to be
erotic. 
 
Then, the young girl proposes, "If each of you will give me $1, I will show
you my legs." 
 
The men, charmed by this young girl, all pull a buck out of their
wallet.  The girl pulls up her dress a bit to show her legs. 
 
Then she says, "If each of you gentlemen will give me $10, I'll show you my
thighs," Men being what they are, they all pull out a ten dollar bill. 

The girl pulls up her dress all the way to her undies.
Conversation continues, and the men, a bit excited, have all taken off their
coats. 
 
Then the young girl says, "If you will give me $100, I will show you where I
was operated on for appendicitis". Naturally, all three fork over the
money. 
 
Then the girl turns to the window and points to a hospital in the distance
and says, "There!"