When I've introduced Poser/DS to young nephews and nieces, they haven't liked it enough to keep using it. They were mostly below teen age and, at that age, the nudity meant nothing to them. They weren't interested in it and quickly put clothing on the figures before playing with the program. Equating nudity with filth and shame is a learned concept, not an innate trait of human beings.

At 15, your brother is three years from being a legal adult. Nudity has a different meaning for him than for a child. Since he can draw, he can already put erotic fantasies to paper if he wants to. Poser/DS will be used in whatever artistic fashion he already is pursuing.

In other words, Poser is just another artistic tool. How it gets used is up to the person using it. The software does not transform the person.

My visual indexes of Poser content are at http://www.sharecg.com/pf/rgagnon