Cephalerotica is the name given to works of art and photographs of humans (mainly women) interacting with octopuses in an erotic manner. It is most popular in Japan.
While photographers such as Daikichi Amano have made their name shooting cephalerotica, others such as William Springfield have also embraced this unusual interest as part of their portfolios. It seems that the octopus is every photographer's dream prop, dead or alive.
Check out the source link below for an image that I couldn't bear to include with this post.