Economy

A guy has some problems with ejaculation and is going to see his sexology doctor.

The doctor masturbate the patient who reach a quite good erection.
The next day, same treatment, same reasult.
The third day, the doctor say to the patient:
"My dear Sir, you are perfectly well and you don't need anymore my care"

"Oh, no! Sorry Doc! I want to meet you regularly: a whore want for this 50 Euros,
and you ask for this only 21 Euros of which 14 are reimbused throught social insurance.