Yeah, I don't think he ment any harm at all. However, he COULD have just as easily shown you where Leatherface cut himself by pointing to his own leg. But then again you were looking at the tv so he probably had to touch you (so you'd know; and not have to look at him and miss some of the movie). But then again.... ahh just kidding!
Oh yeah, also, Leatherface DIDN'T cut his balls off, just like he said; just cut the middle of his thigh