Theories abound as to why full lips have become one of the most sought-after beauty traits of our day, though sensuality is no doubt a keen aspect of the equation.

There is a reproductive drive in chasing after full lips, given their connotations with sexual vitality; some have even suggested that lips are attractive because of their resemblance to the labia.

The trend of full lips may have become a billion-dollar industry in the past few decades, but the desire for full lips finds its roots in psychology, history, sociology, and evolutionary biology.

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