1) HxH's creator, Togashi, said so in his published Hunter's Guide
2) Kurapika was shown half-naked on the cover of volume 14. Aside from the fact that he has no breasts, there are legalities that prevent people from publishing manga volume covers with naked girls on them
3)Watch the anime, read the manga. He sits like a boy, he stands like a boy, he moves like a boy.
So,what do you think?
