Recently a human ear was grown on the stomach of a rat using stem cell technology.
Experimental biology has produced many amazing breakthroughs, including the ability to grow complete human organs. In the future, once medical technology reaches a certain level of advancement, humans might never die. Humans might become immortal. When an organ fails, it will be replaced.
This includes the penis.
Just think. Thanks to the advancement of scientific knowledge, when your limp old dick finally wears out (and it will), one day your doctor might be able to order a brand new one.
Like a forever-youthful god, you and your manly appendage will become immortal.
While it’s impossible to know the future precisely, each new penis that you acquire will probably be grown on a lobotomized clone, in a vat of liquid protein, or on a pig.
Genetic techniques might also be developed, greatly altering humans. Like a lizard regrowing its tail, your future self might be able to regrow a new penis. That is, after your useless old schlong is cut off.
It’s actually even possible that you might grow a second or third penis.
You might grow a second penis on your chin, for example. And then you might grow a third penis on your foot.
The future will be full of astonishing miracles!