Authentic Edo period original, c.1842, Japanese erotic art shunga woodblock print picture by Kunisada Utagawa (1786-1865).  From the shunga series, Shiki no sugatami  (Viewing Forms in the Four Seasons).  Shunga picture measures 15.5 cm x 22.3 cm.  Very good colors and impressions.  Condition is decent+/good with some wear, soiling, hole at bottom right margin.  No backing.  Please see and judge from photos. 
 
A great shunga woodblock print picture featuring a close-up of the female vagina being fingered by an erect male.