How to Block Adult Contents on Safari for iPhone and iPad
If you want to prevent your child from being taken to the adult website by the search results or hitting a link by mistake, you can block the access of these sites on the iPhone or iPad. You are in luck, Apple brings new feature to enable you do this, that is, the Screen time feature. You need to make sure your child's device is running iOS 12 and later to use this feature. Let's see how it works.
Open Settings on your child's iPhone or iPad, scroll down to find and click on Screen time.
Tap Content & Privacy Restrictions on the panel, and switch Content & Privacy Restrictions on.
Tap Content Restrictions => Web Content => Limit Adult Websites.