Advanced NSFW Channel

Let's face it, the current state of setting a NSFW Channel is very basic and Younger kids can easily see the contents of a NSFW Channel by simply clicking "Accept" which they then will be exposed to Inappropriate Content. What I suggest is a Age Block, basicly, the User enters his Birth date and if its at the age of 18, they get accepted but if its under the age of 18, they get blocked untill they become older.