I have to agree with everyone that it's the amount and placement of fat, not muscle that shapes the rear to how you want it. If you want some very definitive proof of this, look at female bodybuilders. The bubble/round shape is definitely missing in these women because that is not how the gluteus muscles actually look like. They are so lean that you can see how that muscle is actually shaped. You can't do "girly" exercises to target this area and make it look more feminine. That's complete BS.
