Teens are opening up to AI chatbots as a way to explore friendship. But sometimes, the AI’s advice can go too far.

For the average young user of Character.AI, chatbots have morphed into stand-in friends rather than therapists. On Reddit, Character.AI users discuss having close friendships with their favorite characters or even characters they’ve dreamt up themselves. Some even use Character.AI to set up group chats with multiple chatbots, mimicking the kind of groups most people would have with IRL friends on iPhone message chains or platforms like WhatsApp.

There’s also an extensive genre of sexualized bots. Online Character.AI communities have running jokes and memes about the horror of their parents finding their X-rated chats. Some of the more popular choices for these role-plays include a “billionaire boyfriend” fond of neck snuggling and whisking users away to his private island, a version of Harry Styles that is very fond of kissing his “special person” and generating responses so dirty that they’re frequently blocked by the Character.AI filter, as well as an ex-girlfriend bot named Olivia, designed to be rude, cruel, but secretly pining for whoever she is chatting with, which has logged more than 38 million interactions.

Some users like to use Character.AI to create interactive stories or engage in role-plays they would otherwise be embarrassed to explore with their friends. A Character.AI user named Elias told The Verge that he uses the platform to role-play as an “anthropomorphic golden retriever,” going on virtual adventures where he explores cities, meadows, mountains, and other places he’d like to visit one day. “I like writing and playing out the fantasies simply because a lot of them aren’t possible in real life,” explained Elias, who is 15 years old and lives in New Mexico.

“If people aren’t careful, they might find themselves sitting in their rooms talking to computers more often than communicating with real people.”