Well, the last part is actually a bit shady. We have seen babies, so if they split; does one part become a baby? That doesn't really add up.
New hypothesises:
- They become fertile (not sure if that's what I mean) by eating rocks (from Dodongo's Cavern. Ever wondered why they really needed you to open it up?). They then lie eggs, which eventually hatch. (You never see a pregnant Goron, do you?)
- Gorons are really bloody evil. They pretend to be nice for you, but really keep their women locked up somewhere.
- There's just one female - the queen. All the other females are killed (except for the next queen), and the queen is the one that gives birth to all the Gorons (like with ants).
- The women look pretty much identical to the men.
- The women look nothing like the men, and live under the water, or in the sky (wait... Oocas?)
- The women are incredibly shy - they just hide as rocks every time a human comes by.