Need a way to block porn on all my devices.

I have tried quitting porn for a long time and I have come to a conclusion that I need it to be completely unaccesible on all of my devices with acces to internet (not being able to turn it of in an easy way) I have tried iphone screentime and it does not work at all, you can eisily turn it off and even if you could not, you can just download a browser that is not safari and the safesearch is not enabled on any of the browsers so you can look at porn images. I want a way were even if I want to watch porn on my devices it will be very hard to do.