because aggression is one of the traits of testosterone just like increased muscle mass, bad breath, body odor, etc.
I guess if you think about it from an evolutionary stand point the male specie needs to be more aggressive to survive, hunt, etc.
Being bald does not necessitate high testosterone levels, it has to do with DHT.
However, the extent of male pattern baldness is not a direct indicator of testosterone levels. The extent of hair loss from pattern baldness is due to a complex interaction of several factors.
see this:
http://www.keratin.com/ac/baldnessbiology/associatedconditions/002baldnessandmalevirility.shtml
I guess if you think about it from an evolutionary stand point the male specie needs to be more aggressive to survive, hunt, etc.
Being bald does not necessitate high testosterone levels, it has to do with DHT.
However, the extent of male pattern baldness is not a direct indicator of testosterone levels. The extent of hair loss from pattern baldness is due to a complex interaction of several factors.
see this:
http://www.keratin.com/ac/baldnessbiology/associatedconditions/002baldnessandmalevirility.shtml