Sertraline (
Zoloft) has such side effects as erectile disfunction, decreased sex drive,
impotence, or difficulty having an orgasm.
What the urologist did is when you are on Zoloft, your sex drive will decrease. This will cause you not to ejaculate as soon as you might have off the medication. It is very complicated, but I understand what your doctor is trying to do. It is very rare to treat PE like this, but I can understand it.
Tell her that you are trying it out.