I guess it depends, I mean when I was 14 I use to look at stuff far beyond what poser can do. And if he is 15 and has internet access well yeah. Teens use the net every day, so really I'm sure that if he sees the virtual character naked it probably doesn't phase him or wouldn't. And figures only start off naked if you add a new morph onto it otherwise Victoria's defualt isn't nude at all. If your concerned, then just wait until the boy is about 17 and then let him use it. Hell my mom had no problem with telling me No I can't use this or that if I wasn't old enough if she knew it had something in it that wasn't appropriate for me to be  using it. There isn't anything wrong with nudity in the first place. Never understood why people were so concerned about that. You can't even do anything sexual with the figures automatically. You'd have to either  buy poses that can allow him to do that, or he would have to be extremely good with the program to customly pose them in that way, which even pros have problems with executing properly. So you have nothing to worry about at all when it comes down to Poser.