Genki Genki is a style of erotic art/pornography that features women with various creatures, many from the ocean. At the forefront of the scene is a man named Daikichi Amano, who has been recognized worldwide for his work. His images and movies are like nothing you've ever seen before, really. He describes himself as both an artist and a pornographer. You can see samples of his work at his pay-for-access website: link here (extremely NSFW!). He also has an artist website featuring his other work: link here.
Below is a clip of some of his work: