A tentacle is an elongated flexible organ present in animals, especially invertebrates such as octopuses. Usually, tentacles are used for feeding, feeling and grasping. In manga and anime, plants may have tentacles as well, in the form of movable vines. And, naturally, other animals and monsters are depicted with tentacles.
Tentacles are most prominently featured in numerous Japanese NSFW works, originally as a measure to avoid having to censor a penis. In these works, tentacles are depicted as a type of fleshy monster whose body is almost entirely composed of tentacles, and they use these appendages on the victim to extract the "nutrients".
