Close up of a couple, with the woman holding the man's knee, underneath a table. (Photo by Peter Dazeley/Getty Images)

Businesswoman with skirt caught in underwear. Image shot 2008, exact date unknown. (Photo by Alamy Stock Photo)

Female female male threesome. My bit on the side is my best male friend. (Photo by Laoshi/Getty Images)

Couple getting intimate on couch. (Photo by Vincent Besnault/Getty Images)

Beautiful woman and man playing domination games in bed. (Photo by nd3000/Getty Images)

Germany, Business couple making love under desk. (Photo by Roman Maerzinger/Getty Images)

Mourning woman. (Photo by Rich Legg/Getty Images/iStockphoto)