Is penis shrinkage inevitable as a man gets older?
Short answer? Yep.
Longer answer: use it or lose it.
"Penis shrinkage is avoidable by using the penis," says Dr. Darius Paduch, an associate professor of urology and reproductive medicine at Weill Cornell Medical College. "Like any organ, atrophy is from failure to use. We recommend two to three sexual activities with full, rigid erections per week for all men, regardless of age."
That’s probably the best prescription you will ever get. Enjoy.
Do people actually have third nipples?
Indeed they do, and not just on Chandler Bing. They are called "supernumerary nipples," and they can exist. "Accessory breast tissue can refer to two different entities, either polymastia or polythelia," says Dr. David Saunders, MD. "Polymastia indicates any accessory breast tissue of any kind. Polythelia refers to supernumerary nipples, aka accessory nipples, aka third nipples. Roughly 1% of the population, both males and females, have accessory breast tissue -- either polymastia or polythelia, at birth."
In most cases, this additional breast tissue can have a small areola and a nipple. Usually these don't have any symptoms or side effects and surgery is an option if you're self-conscious about it.