As well, you can see, how many times thai boxers or mma fighters are getting kicked in the upper leg, and there happens -NOTHING!
And when the accidently get hit in the groin - ITS OVER.
So whats the purpose of kicking the upper leg?
BECAUSE THE GROIN AND KNEES IS PROTECTED BY THE RULES, BECUASE GROIN ITS TO SENSITIVE ORGAN AND BROKEN KNEE ENDS THE CARRIER!
Just to think about, why are the rules there anyway? TO PROTECT THE FIGHTERS FROM SERIOUS INJURIES!