Authentic Edo period original, 1842, Japanese antique erotic art shunga woodblock print picture by Kunisada Utagawa (1786-1865).  From his shunga series, Shiki no sugatami (Viewing Forms in the Four Seasons). 
 
Shunga picture measures approximately 28 cm x 22.5 cm.  Excellent colors and impressions!  Condition is decent due to a 4.5 cm horizontal tear in the picture, just below the woman's exposed thigh.  Difficult to see, but it's there, nonetheless.  No backing.  Please see and judge from photos.

Aside from the tear (which is why the price is under $100), it is an absolutely beautiful antique shunga picture by one the great masters of the art, Kunisada Utagawa.