Sis Swap – A Lesson In Female AnatomyJoshua and his stepsister Coco are forced to organize their parents’ office. Their friend Haley and her stepbrother Oliver join, and the group decides to have some fun with the task at hand. After stumbling across an anatomy book, the girls realize that their stepbrothers have no idea what a vagina is. So, they decide to sit down and give them an interactive lesson on the wonders between a woman’s legs.