I believe that all of us have a much lower GFR with one kidney, though mine hasn't been measured, only my creatinine, which is at .9, normal.
The outside of my left thigh was numb for over a year, I mostly have feeling back in it now-the surgeon said a nerve probably got traumatized a bit during the surgery but the feeling should return and it did (or maybe I got used to it, I can't quite tell, but either way, it doesn't bother me anymore).
As for the testicles, I'm female, too, so...