it has been used

A family went to a hospital, where one of their relatives would be having a brain transplant.

 

One of the relatives asked,

 

"What will the cost of a new brain be?"

 

The doctor replied, "A female brain costs $25,000 and a male brain costs $50,000."

 

The men smirked, but one of the females asked,

 

"Why is that, doctor?"

 

"Well," the doctor replied,” the female brain is less because it has been used."