Let's say medical science gives us the ability to create or repair organs using stem cells. Scientists have already figured out how to take normal cells from an adult and coax them into becoming like stem cells from an embryo. No need to harvest stem cells from human embryos anymore. With more research, we might learn how to make those stem cells grow new organs. Since the organs would be a perfect match for the adult who supplied the stem cells, there is no chance of rejection. This would be great for people with damaged livers. Just make a new liver or augment the existing one. Pancreatic cancer is no longer a death sentence for some people. Instead of waiting to die 6 months, you can get a new pancreas made just for you in 6 weeks. Got a damaged heart from a heart attack? No problem. We'll take a few cells of yours and grow a new heart. Was your penis or testicles damaged or destroyed in an accident? Born with a major defect? Lose your penis due to penile cancer? A doctor could just take a few cells from the man, grow new genitals with them, and attach them to the body. I suspect almost every man would want to replace or repair so personal an organ. But let's consider a what-if scenario ... What if you could coax those stem cells to grow a penis to any size or shape, would you replace your existing organ with a new one even if your current penis is already healthy? You may think that one is fun, but want to double your pleasure. Would you get a second one and keep the first?