I read that access to porn consumption is inversely correlated with rape rates [1]. So it means that the rate of rapes will increase in those areas that fully ban porn. But I suspect sex in general will increase in those areas (see [2]), and maybe birthrates?, as porn consumption is likely inversely proportional to sex in general.

[1] "Victimization rates for rape in the United States demonstrate an inverse relationship between pornography consumption and rape rates." Source: https://www.sciencedirect.com/science/article/abs/pii/S13591...

[2] https://www.psychologytoday.com/ca/blog/sexual-intelligence/...