They're targeting teens who use the internet.
Teens who use the internet are likely to have had some exposure to memes, unless all they do is check CNN for news.
Memes are five times out of ten NSFW. Or perhaps, NSFTV.
Cartoons have always had loveual innuendos.
You're right, perhaps I should rephrase.
The innuendos have become less and less discreet.