A covered erotic Chinese porcelain plate, c. 1900, showing two scenes of couples having sexual intercourse, one on horseback.   In the collection of the World Erotic Art Museum, Miami Beach, Florida. Photo by Jim Heaphy.
<a href="//commons.wikimedia.org/wiki/User:Cullen328" title="User:Cullen328">Cullen328</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>