There is no scientific basis for the statement that the thickness of the lips has nothing to do with the strength of sexual function. The reason why there are “thick lips of people with strong sexual function”, most likely because some ancient phase books have this statement. But this is superstition, not scientific and can not be trusted, the strength of sexual desire generally can not be seen directly from the appearance. Thick lips and congenital genetics and acquired development and disease and other factors lead to. Generally speaking, genetic genes, the habit of licking and biting the lips, as well as lip allergies, lip inflammation and lip mucosal ulcers and other diseases can lead to thicker lips, the lips suddenly become thicker it is best that you should go to the hospital as soon as possible to check and treat the primary disease.