Please explain to me what is going on here. I need more information before I approach him on this matter?

Sounds like a bit of a weird case. I'd have to say that maybe he's lying to you because he's ashamed of this possible 'addiction' he has to watching this kind of ultra-nasty ****. Either that or he's sick of letting you down when it comes to this sort of thing so he's trying to desensitize himself to it by watching the worse sort of **** he can find.