Just in case there is more to it than just your spine (unsure if your case is from injury or what-have-you), check for other pudendal nerve problems that can occur, such as scar tissue build-up in the alcock's canal as it passes from the spine to front of your body to innervate the **** and genitals. Other things can entrap this nerve as well (piriformis muscle problems is one). The pudendal nerve is one of the nerves your spine affected, causing numbness or pain - usually the culprit of such down-there symptoms.
Femoroacetabular Impingement (FAI) or hip impingement syndrome can also cause similar symptoms. Good to check if you have any hip symptoms with it.

Im 40 and have had 2 major lower spine surgeries since 2006. Last surgery was March 2013. They did a multi level fusion.. .. Im in same or worse pain still. My left leg from knee up is completely numb, both feet and right leg get numb a quarter of the time.. . I have lost about 30-50% use of left leg and within last month have numbness on tip and left side of penis..It is also very hard to achieve a full erection, and to maintain it..Only thing that works is Viagra.. . I have had Epidurals, 30 facet blocks. Recent CT scan and MRI show Sacrum joint damage, arthritis in both hips, all of spine... Im very frustrated, might need another spine surgery as well as spinal cord stimulator implant. .. . Thing I'm worried most about is the sudden numbness on my penis and erection problem.. .

Any guidance or suggestions would be much appreciated. .. . I have been a Cop for 16 years and prior to that a Navy and Army Veteran. I'm a 70% disabled Veteran. ..