Humans have certainly found some strange and bizarre places to have sex. Not to be outdone this adaptable couple have selected a series of hinged porcelain fruit for their carnal encounters.

Porcelain fruit, hinged, contains male and female copulating, Oriental
[Wellcome Collection, London]
Although obviously Oriental, apparently no-one is quite sure exactly when or where they come from.
More on some of the ruder exhibits in London’s museums at http://londonist.com/2011/03/the-top-10-rudest-museum-exhibits-in-london.