![](/static/253f0d9b/assets/icons/icon-96x96.png)
![](https://lemmy.world/pictrs/image/44bf11eb-4336-40eb-9778-e96fc5223124.png)
You’re right. It’s not just legal reasons. There are some neat studies showing that if two people under the age of 5 are raised in the same household together, feelings of sexual attraction generally don’t develop later when you’re sexually maturing. So the porn somewhat follows reality in the scenario of step-siblings being more likely to develop sexual attraction.
That cropping has to be deliberate.