Please update the game so that I can change my character from a girl to a boy.

There's no set genders as such. Regardless of which preset you chose at the start, you can alter the character to look like any of the other presets (or totally different) after. In the 'body shape' selector, I think the odd numbers represent more male builds and even numbers more female. Then fiddle with the chest/hips/booty sliders. Hope this helps.