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)

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

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

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

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

Coulpe in bed, secret lover hiding. (Photo by Peter Cade/Getty Images)