Blue-footed booby (Sula nebouxii) courtship behavior in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

An orangethroat pike blenny (Chaenopsis alepidota), displays its colors in hopes of attracting a mate, Sea of Cortez.

Bull and cows in meadow near Easedale in the Lake District National Park, Cumbria, UK

Couple showing photograph strip from photo booth

Couple walking on boardwalk at amusement park

Couple posing in photo booth at amusement park

Couple hugging face to face at amusement park

Woman making man kiss inflatable pink dolphin at amusement park

Multi-ethnic couple dancing at nightclub

Couple standing on boardwalk at amusement park

Friends posing on boardwalk at amusement park

Hispanic couple about to kiss

Couple posing for selfie on boardwalk at amusement park

Hispanic couple having picnic

Multi-ethnic couple smiling at each other

Multi-ethnic couple hugging at beach

Multi-ethnic couple hugging

Multi-ethnic couple sitting on bicycle

Caucasian couple kissing at picnic table

Multi-ethnic couple hugging

Multi-ethnic couple hugging

Multi-ethnic couple dancing at beach

African couple smiling at each other

A lioness (Panthera leo) is about to slap a male lion with its paw after mating. They both have golden coats and are standing on a patch of burnt grass in the warm evening light. Shot with a Nikon D810 in the Serengeti; Tanzania

Close-up of lioness (Panthera leo) slapping male with paw, Serengeti National Park, Tanzania

Male Masai giraffe (Giraffa camelopardalis tippelskirchii) mounts female by impala (Aepyceros melampu), Grumeti Serengeti Tented Camp, Serengeti National Park; Tanzania

Two Kodiak Bears (Ursus arctos middendorffi) being affectionate and playful as they sit in grass, Katmai National Park, Alaska, United States of America

Rock hyrax (Procavia capensis) lies on another on rock, Serengeti, Tanzania