This is how they share the body.
Of course there is the questions like do they both have the urge to go potty, what if one wants to run, sleep, do whatever and the other doesn't.
And then there is more personal questions like what if one falls in love, what if they both do but with different people? Abby and Brittany think they might like to have kids and the organs seem to be in place for that. Say they both marry different guys, I mean they have different spirits/souls so shouldn't there be two guys? And one hubby gets them preggers, is only that girl the mom, or are they both the mom? Aaaaah, you could go on forever.
I don't know, it boggles my mind that Heavenly Father even allows this type of body to happen.
But let me be clear, I think these girls are absolutely amazing. I (for once) am not trying to mock anything about this situation, it's just fascinating on so many levels.