What do you think about (consensual) child/teen(<18) pornography?

There is no such thing. By definition, a minor cannot consent to making porn. A minor is incapable of even making a contract to buy a car, why should we allow them to make a decision that would affect them for the rest of their lives? Once porn is made, and is out there, that's going to be available for anyone who Googles their neme to find out about.