There is a NSFW Tag on Adult games, isn't that enough?
Please keep in mind that these are games, and they have PLENTY of warnings before experiencing it, now matter what... They are fictional forever, Data Pixels on the screen, if anyone is fragile enough to be affected by this then they really need a reality check or a Guardian watching over them as they play anything.
if you see any game promoting "Bad content" or "Hateful" then please contact the Dev to atleast give a NSFW warning and tag their game as NSFW so those who chose the "Filter out AdultContent" setting won't get this viewed to them, if they didn't comply Then i "THINK" you have the right to report them.
Goodluck on maintaining your purity.