Tentacle erotica
Tentacle erotica (Japanese: 触手責め, Hepburn: shokushu zeme; lit. 'tentacle attack') is a type of erotica most commonly found in Japan that integrates traditional pornography with elements of bestiality, fantasy, horror, and science fiction. It is found in some horror or hentai titles, with tentacled creatures (usually fictional monsters) having sexual intercourse, predominantly with females or, to a lesser extent, males.