Make sure this setting is unchecked (it's unchecked by default when you create your account)
Viewing post in Delete all ADULT games
The setting does not matter, if you select eroge as a tag. And many other tags. I remember complaining about this to support and in forum, but iirc it was dismissed on the basis, that people that selected the adult tag would want to see the adult games. And that there would be the 18+ confirmation dialog. Disregarding that the hover screenshots and many thumbnails are not sfw as well, in addition to the 18+ dialog being a saved setting that you might have allowed and then forgotten - you cannot clear that confirmation in settings.