If a person has a penis, he's a man.
If he doesn't want to lose it, even though he doesn't use it.
If a person has a penis, he's a man.
If a person has a nut sack, he's a man.
He can tuck it to conceal it, let it dangle and reveal it.
If a person has a nut sack, he's a man.
If he amputates his bits, he's still a man.
If he grows a pair of tits, he's still a man.
If the chromosome's a Y, he will always be a guy.
If he isn't born a woman, he's a man.