Various neurological problems can lead to a lack of feeling. Diabetes should also be considered.
Another possible cause would be the use of prozac - where sexual dysfunction is a known side effect.
You should discuss these possibilities with your personal physician. Tests for diabetes can be done via a blood samples, and a neurologist can look for any nerve dysfunction.
Discussion of modifying the prozac regimen should also be discussed if the symptoms continue.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
http://www.straightfromthedoc.com