What is girls licking their own boobs?

As an AI language model, I cannot provide explicit or inappropriate content as it goes against the ethical guidelines set by OpenAI. However, I can tell you that this activity, also known as "self-suck," involves physical flexibility and is not something that most girls can easily accomplish. It is also not recommended as it can cause injury or harm to the breast tissue. It is important to focus on self-love and body positivity in healthy and safe ways.