The discussion about the moral issues/pros/cons of porn and effects/marriage etc. could be discussed for hours...
....my point is in this case:
a) Don't get the elders involved - many of you have stated correctly: it is a bigger problem in the little twisted JW world - the issue itself will be pushed to the back, the poor fellow AND his wife AND his daughter will soon feel the heat of the hell fire that this BOE has....politics come into play (will they cut the guy off, is it a good political move, all kinds of nasty things that have nothing to do with the original issue). All of that under the banner of: "He-needs-help-where-gona-help-him"
b) He is a independent, free moral agent. He has HIS own free will and mind. Let HIM work this one out. Let me tell you, THIS might be the trigger for him to leave the BS he is in. It is excellent to hear that he is so stiff and demanding, but is giving in to his own "weaknesses". THAT IS WORTH GOLD alone. Man, look at the situation we have here. I know elders, ms that are so self-rightness and harsh on others...but once they look into the mirror of reality, they discover that THEY aren't better/worser than others. THIS could be the BIGGEST lesson in this guys life! He is RIGHT now learning more about humans, human behaviour, needs, emotions than he will ever by reading a WT or Awake magazine.
If it disgusts him, he will stop. But if you stop the process "artificially" by some elders hammering down on him, AND PLEASE REMIND HER: on his family, too (meetings with him, meetings with him&wife, interrogation of daughter, calling in of daughter against father if he denies, .....unpleasant to say the least!)
Tell her that her father is exercising his free will (maybe for the first time in his life!). He is braking the bonds with the WTBT$ - willingly or not - but he is....for many that is the initial process to loose the tight control. ...They forbid this a hundred times and he is braking the rules....good for him!
......and if he gets some pleasure in the process....hey, that ain't too bad either.....
Tell her not to worry. We are humans. Sexuality is part of humanity. Sexuality is all over the Bible, Salomon was having a good time with his 700 wifes...Song of Solomon talks about some dripping liquid under the lover....
And YES, why not face it: naked boobs have some chemical effects on a guys mind....it is built in.