UK: https://yougov.co.uk/topics/society/survey-results/daily/202...
US: https://issueone.org/press/new-poll-finds-near-universal-pub...
Aus: https://au.yougov.com/politics/articles/51000-support-for-un...
So far as I know there's nothing confounding here - people from across the political spectrum just seem to think it's a good idea to introduce age checks and to restrict children from accessing adult content.