The real question is, how does he have any feeling in either penis? You only have one cell that runs lengthwise to the sacral part of the spinal cord, a dorsal root ganglion. Well, actually, you have multiple, but each sensory location on your private parts has its own dorsal root ganglion. Anyway, as far as I understand, you can't regenerate intervating nerve fibers, so how would he be able to have sex and achieve orgasm?