one of yes. the only one? no. it can be perfectly safe, and it can be part of what helps them regulate if done right.

we dont know this kid. we dont know why he is doing this. everyone jumps on porn as the reason like he is sitting there watching incest videos and getting ideas.

if he knows whats reasonable and realistic, and is given the toold to sort himself out, chances of inappropriate behaviour should go down. that is unless there is a bigger reason, and i dont think its porn.

everyone jumps to the worst conclusions on instinct, but everyone forgets it could be as simple as he isnt getting his needs met in the correct manner. fix that by reeducating him, and see how it goes. if there is another reason, thats all the more reason to talk to him about it and have the conversation.