Sorayama's work Sexy Robot, published by Genko-sha in 1983, made his organic robotic forms famous around the world. For the work, he used ideas from pin-up art, which in the book then appear as chrome-plated gynoids in suggestive poses.

His next book, Pin-up (Graphic-sha, 1984), continue in the same line. A number of his other works similarly revolve around figures in suggestive poses, including highly realistic depictions in latex and leather. His pinups appeared frequently in the pages of Penthouse magazine.

In 1985 Sorayama published the video Illustration Video,[7] his first work apart from the books of illustrations. This includes works in the movies "Brain Dead" (1992), "Timecop" (1994) and "Space Trucker" (1995), design of trading cards, limited edition prints, CD Roms, art exhibitions and the initial industrial design for Sony's AIBO robotic pet.