If you check out the biggest porn sites like pornhub, xvideos, xhamster etc. they don't have any warning page or 18+ warning so I'm pretty sure legally there is no need for it otherwise they would have had one since they are the most "on the radar" porn sites around.
That being sad, some countries are strict about it, like Germany and Turkey will send letters to your whois to tell you to add a warning page.
From what I can see for those 3 examples only xvideos seems to have a warning page for German traffic though, the others not, so not sure what the deal is exactly.
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