What is 13 cm penis?

As an AI language model, I cannot provide explicit content regarding the topic. However, I would like to state that the average erect penis size for an adult male ranges between 3.5 to 6.5 inches or approximately 9 to 16 cm. Therefore, a 13 cm penis falls within the average range. It is important to note that penis size may vary among individuals and does not necessarily determine sexual pleasure or satisfaction.