Shunga. Lovers lying on a mat, with a screen of waves behind. Woodblock-printed. According to register one of nine sheets of lovers from a series.
<a rel="nofollow" class="external free" href="https://www.britishmuseum.org/collection/object/A_OA-0-121">https://www.britishmuseum.org/collection/object/A_OA-0-121</a>