This is Dr. David
sounds like pretty bad cauda equina syndrome.
your S1 sacral bone could be pressing on your sacral plexus and causing loss of sex sensation.
are you able to control your urination and bowel movements.
many of the sacral plexus nerves exit the sacrum and control pelvic functions such as urination and bowel movements and sexual function as well.
you need an MRI scan of your pelvis and sacrum
to see if the sacral plexus was damaged in the surgery.
it sounds like all of those sacral plexus nerves have been damaged or severely injured in the surgery.
these nerves control sexual sensation, bladder function and bowel function.
it sounds like they are being very defensive.
because they know they caused this numbness for you.
you can ask to try medications like neurontin or lyrica
to see if they help your nerves recover
you should ask to see a neurologist.
to get nerve conduction studies of your pelvis and sacral plexus.
and see if neurontin or lyrica can help.