Thanks for the reply. I checked my settings and the block - show adult content - isn't ticked.
However, I was just browsing the new games this morning and came across 3 - one fully nude, 1 sex themed, 1 drug themed, so clearly those developers hadn't ticked the appropriate box themselves.
There needs to be a better system than relying on developers to tick a box - because that's not a reliable system.
Perhaps something like a keyword filter, if your game has keywords nude, drugs, sex in it that it automatically marks it as adult content.