Authentic & Original Edo Period shunga woodblock print picture.  From the Kyowa era, 3rd year (1803), it's an extremely rare & taboo-themed Japanese erotic art shunga scene by Kitagawa UTAMARO (1753-1806).  From his famous shunga series, Ehon warai jogo (The Laughing Drinker).  The shunga picture measures approximately 26.6 cm x 21.7 cm.  Very good colors and impressions.  Good condition with just some wear and soiling, most notably at the bottom corners.  Very thin and nearly transparent washi backing on reverse.  Please refer to photos.   
 
A very rare and unusual original shunga woodblock print picture from 1803.  In this taboo-themed scene, a brother and sister are caught in the act of their incestuous relationship by their father who stumbles upon them while opening the shoji (sliding door).
 
Authenticity Note
Shunga was never meant to be disposable.  It was made by skilled artists, printed with care, and kept because it mattered to the people who owned it.
The safest rule is simple: buy from someone who clearly cares whether it’s right or not. 
As a general rule, serious collectors avoid silk-printed shunga.  These are decorative works, not woodblock prints, and they hold no meaningful value within the traditional collecting field.