It's really not a good thing when the complete post together rationalizes an an answer for the topic at hand and you pick random two words in it taking it out of context and pretend you understood.
I'm not repeating anything, since it's written in text above.
Reread it, and ask me what didn't you understand.
Since you obviously didn't understand the post, I'll randomly guess what's wrong with you and elaborate.
Striking the thigh/leg/foot/butt in boxing is absolutely illegal. thus putting these body parts in the way of the punch is illegal. duh.
However in kickboxing it is absolutely legal, and in MMA you have even more range such as foot stomps, for example yoel romero and benson henderson have utilized punches to the thigh very effectively in fights.
But again, I'm being realistic and saying most boxing matches, especially on the highest level rules are usually broken all the time, many times in the same round too in certain situations. I mean unless you're blind or very stupid or never really watched boxing.