Duolingo™ isn't only a beneficial resource for those looking to master a new language. It has also become popular with language aficionados. However, unfortunately, it seems that even this cherished platform also falls victim to the controversial Rule 34 phenomenon.
Many have discovered that Duolingo® + Rule 34 fusion exist out there. It might come as a surprise, but ostensibly, there are actually enthusiast-created artworks based on characters of Duolingo which adhere to the infamous guideline that states "if it exists, there is porn of it."

Duolingo Rule 34 Rule34HQcom