Castle Orgies (色暦大奥秘話, Irogoyomi ōoku hiwa) aka Eros Schedule Book: Concubine Secrets and Sensual History: Shogun's Harem Secret Story is a 1971 Japanese film in Nikkatsu's Roman porno series, directed by Isao Hayashi and starring Setsuko Ogawa and Yoichi Nishikawa.

Apartment Wife represented the contemporary, urban stories, and Eros Schedule Book the historical period film.

[9][10] Castle Orgies was first released theatrically in Japan on a double-bill with Apartment Wife: Affair In the Afternoon, on November 20, 1971.

[12] Along with Coed Report: Yuko's White Breasts (1971)-- part of Nikkatsu's second double-bill-- Castle Orgies was the subject of "Japan: Ancient and Modern", a feature in the March 1973 issue of the British journal Continental Film Review.

[13] The film was released by Tai Seng on all-region DVD on April 17, 2001, with Chinese and English subtitles.