Talking to younger teens about porn - any tips or resources?

[meditrina]

I'm sure he's not looking at porn (from home, anyhow), and is generally still in the "girls yuck" stage. But he 's come across the term porn, and I want to start the education process now that he has some means of putting it into an adequate context well before early experiments on searching on devices elsewhere is likely to occur.

Does anyone have any good tips, or know of any particularly good resources, on how to go about this with a boy who is still in the stage when he knows about sex but simply does not get why anyone would want to do it for fun?