I would consider peer pressure in your decision.

Does he have friends who are likely to say 'Wow you got Poser, you can make all kinds of porn pictures with that and share them around" or even worse "You can get all kinds of stuff for Poser from +++ site without paying for it" Then I think it may be a bad idea because he is at risk from being thought of a a sleaze, and getting drawn into sordid places and bad ideas.

If he has the strength of character to resist those kinds of temptation ( and I would certainly warn him to avoid pirate content anyway) then ok.