Authentic Edo period original,　1831, Japanese erotic art shunga woodblock print by Sadatora Utagawa (active from 1820-1844).  From his shunga series, Kai chu so shi.  Shunga picture measures 22 cm x 24.5 cm.  Very good colors and impressions.  Condition is good with some wear and soiling, couple stains on reverse side.  No backing.  Please see and judge from photos.
 
A rare shunga woodblock print picture by one of the more obscure artists of the Utagawa School.  In this comical scene, part three of three, the male and female samurai continue to have intercourse indoors, while the lower ranked samurai here are sadly left to voyeurism and their erections.