Hieronymus Bosch (Jeroen van Aken, ca 1450-1516), The Garden of Earthly Delights, triptych (ca 1500), central panel detail 11.
Prado Museum, Madrid.

The apotheosis of apparent innocent sexuality is interspersed with numerous irritating factors of perverse behaviour, shown for instance, in the scene where a youth thrusts some flowers into the rectum of his companion.