Authentic Edo period original, c.1855, Japanese erotic art surimono (privately commissioned, high-quality print) shunga woodblock print picture by Utagawa Kunisada II (1823–1880).  From his shunga series, Shunkyo karami-dako (Spring Games: Grappling Octopus)  
 
Shunga picture measures 9.2 cm x 12.2 cm.  Very good colors and impressions.  Very good condition with some light wear.  Thin backing with embossing/impressions still clearly visible.  Please see and judge from photos.
 
A somewhat sorry surimono shunga woodblock print picture, as the male on the left is being denied his opportunity at a threesome experience.  He covers his eyes as he cries in shame, while the other confident and well-endowed male leisurely smokes a kiseru (Japanese tobacco pipe).  Meanwhile, the female beauty sadly explains - while pointing at the unlucky one's phallus - that it simply isn't up to snuff!