A. You can setup the restriction on adult content for your each device.
As the gif picture shown as below, at the time of opening adult content the tab as the gif picture is popped up. If you click "No", you will go back to the top page. If you click "Yes", you will start viewing the content.
If you would not like to display the tab again, please select "常に開く場合はチェック" and then click "Yes". The procedure is the same for both smartphones and PCs.