store.steampowered.com
en.m.wikipedia.org
This is now blocked by age verification. It's on my wishlist already so I can still purchase it, but I can't view the store page. I've not played it. From what I gather, among other adult themes, it contains sexual acts, but this doesn't appear to be the main focus.
Other games will be affected eventually and given their content I fail to see how games like BG3 or GTA will not be.
Making it difficult to legitimately purchase games will only drive people to piracy, so this will contribute to even fewer adult themed games being developed and censored regional versions in the UK for those big releases.