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How will I prove my age?
There are lots of different companies developing age-verification software.
So there are likely to be a few different ways you'll be asked to prove your age, depending on the site you visit.
It could mean entering your phone number, email address, or credit card details.
It could also mean going to a shop, handing over ID and collecting a 16-digit code to use on a porn website.
MindGeek, the biggest online porn company in the world, has introduced its own age verification service.
It owns streaming sites like Pornhub, YouPorn and RedTube, as well as production studios including Brazzers.
The company's product AgeID expects to sign up between 20 to 25 million UK users.
Although the final details of what its age verification process will be hasn't been announced yet, a spokesperson told Newsbeat: "AgeID has multiple third parties covering such methods as a Credit Card, mobile SMS, passport and driving licence.
"However, the regulations pertaining to which age verification methods are to be compliant with the law have not yet been published nor made their way through parliament, therefore AgeID will adapt as these come to light."