Many women do more than that when they're alone with themselves. But the contrived rules do not allow them to relax with a partner. It is not without reason they say, that a smart woman has it in her head, a fool has it in her mouth. I even know men who categorically reject such liberties.
How she quietly takes out her brother's dick - apparently she does it regularly. And he's been dipping his sister's ass, too, apparently. Because that side of the coin is as well developed as the pussy. Incest doesn't even seem to bother this bitch.