Historically women have taken more pictures than men (see below quote), and I would hazard a guess that it still continues. I do know that at almost all the family parties I show up to that "Aunt Mildred" or "Aunt Bernice" tries to round us all up for a photograph and rarely is there "Uncle Bernie" or "Uncle Earl" with the camera...

Below per WSJ. An article about Kodak....

As a result of Kodak’s efforts [to market to the “Kodak girl”, who symbolized the modern, adventurous female], women went on to become the most lucrative market segment for photography. It was that loyal contingent of “soccer moms” that funded Kodak’s inexorable rise: they took more pictures than everyone else, printed them, shared them at coffee mornings, saved them in albums and displayed them in the living room.
http://blogs.wsj.com/source/2012/02/...-five-reasons/