A book about body awareness and self-protection by Spiegel bestseller author Dr. med. Konstantin Wagner, a specialist in gynecology and obstetrics. Developed in collaboration with the MuT Center, a center for violence prevention by Sonja Blattmann and Karin Derks. Do adults always know best? How do I take care of myself? And is it okay to say no? Determinedly defending personal (body) boundaries is not so easy. In this lovingly designed book, Lasse and Mathilda convey extremely important messages to young readers: It is always okay to ask for help. It is absolutely right to stand up for oneself. And it is very important to call out "stop" firmly when feeling uncomfortable. Note: Children are never to blame when their boundaries are violated—regardless of how loud or quiet their "stop" is. The responsibility always lies with those who cross the boundary. With illustrative situations, child-friendly explanations, and an important mission free from inhibiting uncertainties, weakening doubts, and false politeness. Behind the QR codes are explanatory videos for adults with valuable educational background knowledge and helpful everyday tips.