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You described two different things: a psychological effect first, and then a market. The elephant example isn't mere-exposure.

Also, I'm not an expert on this but do we see more sensless killing by kids playing violent video games? This is usually the counter example to the exposure argument and I haven't seen it properly argued against.

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In the US there's also been an interesting rise in sexlessness and male virginity recently [0] which is a fun one to compare with exposure to pornography. There is evidence that real-world conditions have a lot more to do with real-world action than pictures on the internet.

[0] https://ifstudies.org/in-the-news/young-adult-sexlessness-sk...

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