Part from King_Of_Hyrule's almost spammy way of asking, he does have a valid point. We don't know if there are female Gorons, simply cause no one knows what they would look like. Therefore there might be female Gorons in the game.
However, since the Gorons keep refering to each other as brothers (mainly Darunia, but whatever

), we get the feeling that they are all male. The fact that there are great differences between male and female Zoras also adds to it, I suppose. The player wants to see a difference between the genders and when that does not appear, one looks for the easiest answer.
Oh, well. Perhaps the creators made a whole male race to weigh up against the Gerudos that are all female?