Authentic Edo period original, Bunsei era 8th year (1825), Japanese shunga erotic art woodblock print by Kunisada Utagawa (1786-1865).  From the classic shunga series, Hyakki Yakou.  Shunga picture measures 27.5 cm x 21 cm.  Very good colors and impressions.  Condition is good with some wear and soiling.  No backing.  The discoloring on the male is the result of the oxidizing of the paints, which is quite normal.  It is not foxing.  Please see and judge from photos. 
 
A very rare shunga scene of a couple engaged in anal intercourse!