Son Goku set out determined to find a proper female for Kame-senin so the old man would train him. He searched the globe wondering what sort of female he should get. He hadn't seen very many females in his life so far, because he had grown up in an isolated area far away from other people with only Grandpa Gohan for company.
He was almost certain that he could tell the females apart from the males just by smell now, but he would probably still have to pat to double check. He honestly didn't understand why people got upset when he did that though.
Eventually, after searching for what seemed like forever and rejecting countless extremely skinny ones like Bulma, he found one his instincts were telling him was the right choice. She was of a good size, she was apparently rather strong based on the weights she was lifting and somehow, he could just tell that she would be able to bear many healthy offspring. Master Roshi would be happy.
&!&!&
Muten Roshi excitedly raced out the door when he heard little Son Goku return. His heart raced with excitement as he imagined the sort of girl the boy had brought back. Each image was racier than the one before it.
Reality was a huge letdown however. Instead of a delicate beauty like the ones he had been imagining, he found himself looking up at an extremely massive woman. She was fat, she was ugly, and she looked as if she could break him in half like a dry twig if she were so inclined.
&!&!&
Goku sat there staring at the two pictures in confusion. Master Roshi had told him to pick out the attractive one. One of the females looked as if she would bear several healthy offspring, and the other - to put it plainly - did not. However, he had the distinct feeling that Master Roshi didn't want him to pick the one he was thinking of.