 There are some facts and theory's already present with the masculinity of a person and testosterone levels. But what about their appearance, is a connection present? Well there may be a slight break through in the testosterone levels at birth and their changes during puberty to becoming adults.  So what is there to love about chemistry? Lets find out. What is chemistry?
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Photos used under Creative Commons from truebacarlos, Oneras, Robert S. Donovan
