Some personal experience.
Male (obviously), 33, happily married, and I've lost all erectile function after the J-Pouch creation surgery (it was an open surgery due to previously formed adhesions). J-Pouches are still an extremely rare thing in Russia, but I've been able to find an experienced surgeon in Moscow. Still, it's never an exact science.
Around 3 months out I've had my first sexual dream, and now I'm slowly able to get a kinda half-boner. It's still nowhere near rock hard, but we're getting there.
I still have some sensation down there, and month after month it's getting a bit better. I am able to masturbate and get to an orgasm, but nothing comes out. Actually this part doesn't concern me, as I'm not planning on having kids anyway (was originally aiming for a vasectomy after takedown, but I wonder is it even necessary with retrograde ejaculation).
At this rate of improvement, I don't expect getting hard as in "penetration-ready hard" in at least another couple of months. I will consult with my surgeon after takedown (scheduled 3 weeks from now), maybe he will refer me to someone and fix me up with some meds, but I'm not undergoing another surgery to fix my erection. If it's permanent, so be it. It's not the end of the world.