Impala pictured in the Kruger National Park on December 7, 2007 in Mpumalanga, South Africa. (Photo by Warren Little/Getty Images)

A leaf from a sweetgum tree (Liquidambar styraciflua) lies on the grass at Godewaersvelde early October 27, 2017. (Photo by Philippe Huguen/AFP Photo)

Strokkur geyser against cloudy sky at sunset. Strokkur is a fountain geyser located in a geothermal area beside the Hvítá River in Iceland in the southwest part of the country, east of Reykjavík. It is one of Iceland's most famous geysers, erupting once every 6–10 minutes. Its usual height is 15–20 m, although it can sometimes erupt up to 40 m high. (Photo by Teatsche Dijkhuis/Getty Images/EyeEm)

Mature woman lying on bed, rear view. (Photo by Andersen Ross/Getty Images)

Portrait beautiful woman on the beach, Landing aircraft above the beach at Phuket Airport. Mai Khao beach, one of the most popular beaches among tourists in Phuket. (Photo by Southtownboy/Getty Images/iStockphoto)

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

Women in lingerie touching each other. (Photo by BDLM/Getty Images)

Woman and man playing domination games in bed. (Photo by NDAB Creativity/Rex Features/Shutterstock)