Erotic Roleplaying
Erotic Roleplaying (ERP for short) is... well, kind of obvious. It's a form of roleplaying in which sexual scenes and/or fetish fuel are blatantly invoked, often to the point that one is literally roleplaying a sexual act. The difference from a magical realm is that ERP is welcomed by all participants, whilst the magical realm is one member of the group forcing their sexual fantasies into group's faces despite their discomfort and lack of desire to interact with it.