I dated a girl who had this condition naturally. It was interesting to say the least.
I had a girl friend that had this condition also. Her third nipple was below the right one and resembled a large mole. She said it enlarged somewhat and weeped milk after the birth of her son.
She said it was a dominant trait and several members of her family, both male and female had three breasts.
I met a woman who had three nipples. She had two normal ones and a third right in the middle of her chest. I think she enjoyed showing it to people because she showed a group of us within five minutes of meeting her.
I hadn't ever heard of it before. "More than a handful."
A man with two penises would be cool. : )
I dated a guy who had one blue eye and the other was green. But TWO penises...that would be a blast.