What is bad: distorting young (or old) people's images, coercion, violence, rape.
What is good: nekkid wimmin (or men if you are of a female or gay persuasion).
What is distasteful: 99.99999% of internet porn (of COURSE I've seen 100.00000%), which is about as stimulating as a gynaecology text book.
What else is bad: every site is trying to get hold of your credit card details or plant a spambot on your computer.