The Australian government has proposed using a facial recognition system it is developing to verify that people who seek to watch pornography online are of legal age.

Current law in Australia does not prohibit minors from viewing pornography. But the federal government is considering proposals that would require people to prove their age before watching the material.
https://www.nytimes.com/2019/10/29/world/australia/pornography-facial-recognition.html

Also see:

Australia wants to use face recognition for porn age verification
Lawmakers in Australia (like their counterparts in the United Kingdom) are looking for an effective way to limit kids' access to online pornography. Australia's Department of Home Affairs has a possible solution: face-recognition technology.
https://arstechnica.com/tech-policy/2019/10/australia-wants-to-use-face-recognition-for-porn-age-verification/