How do I help my teen daughter understand why porn is bad?

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While I agree porn should not be the forefront of what a teenager watches, what harm is it really doing?

The biggest issue is her age vs legality of her viewing porn at her age. Technically it could cause legal problems for you as the parent if someone decides they want to press the issue, like another parent upset about what their child accessed from her profile or whatever. That is what I would focus on.

I would also explain that porn generally gives a very unrealistic view of what sex is in real life.

But as far as reputation, everyone watches porn, or has watched porn at some point. Or reads porn if you count the often graphic romance novels. She could get called a whore, but if she doesnt care what "they" think of her, that probably is not going to matter to her.

But, be aware, whether you allow porn or not, she will still have access to it because you simply cannot monitor the entire internet, or her use of the internet outside of your home. Also be aware that statistics show that those who know masturbation and other forms of self stimulation are available, are more likely to have their first sexual encounter with another person at a later age.