Inserting plates in their lips to look unattractive
In parts of modern day Chad and Mali and other north African countries, many women were captured mainly because of their beauty. These women attracted the slave masters, merchants and sailors and they were very expensive and in high demand. Unfortunately, many were impregnated and killed on the ships by the time they got to their supposed destinations.
In order to avoid being captured women in Chad started to wear rings on their lips to expand it, leaving it flappy and very unattractive. The technique prevented many of them being sold into slavery and soon became part of tradition.