Artificial limbs help one restore an active life by restoring required functionality to the body. I don't find erections, or peeing standing REQUIRED functionality of the body. Nice-to-haves, sure, required, no.
Does a new leg restore the ability to walk? That's ok. Does a new hand restore the ability to cook and clean and work? That's ok. What functionality does restoring a penis do that is required to live?
I am not a fan of breasts augmentation, facial reconstruction (unless it restores lost functionality like jaw breakage, eye function, etc) or most definitely pectoral and abdominal implants. Vanity is not a good reason to undergo surgical procedures. It is your choice, I guess, but it's a shitty one.
you don't need to walk to survive, get over it and enjoy your wheelchair.
you don't need two hands to cook and clean and work. learn to clap with one hand.