I had to wonder how easy it would be to change to your skins while reading that. I mean, if you were locked in your skin to start with, that would be annoying and no fun. If you could change between genders, simply change which gender you are for every task, and get a bonus for each day. That's a little wierd, but a ridiculously easy trick if you can pull it off right. Sort of like lowering your maximum sight range to keep all the lightning and predator spawns in a closer area. Unfairly cheap, and slightly unrealistic.
If girls are faster, put on a girl's skin when you prepare to go on a long trip.
If guys are stronger, put on a guy's skin when doing typical yardwork, like slaughtering the wolves on your front porch every morning.
Transgender on a daily basis- how to play smart in Survivalcraft. :P