Duolingual isn't only a beneficial tool for those looking to pick up a new language. It has also become popular with language aficionados. However, sadly, it seems that even this cherished platform also falls victim to the controversial Rule 34 dictate.
Numerous individuals discovered that Duolingual + rule 34 fusion exist. It could come as a surprise, but evidently, there are actually fan-made illustrations based on characters of Duolingo which adhere to the infamous rule which states that "if it exists, there is porn of it."