Callahan's work was a deeply personal response to his own life. He encouraged his students to turn their cameras on their own lives, leading by example. Callahan photographed his wife over a period of fifteen years, as his prime subject. Eleanor was essential to his art from 1947 to 1960. He photographed her everywhere - at home, in the city streets, in the landscape; alone, with their daughter, in black and white and in color, nude and clothed, distant and close. (https://en.wikipedia.org/wiki/Harry_Callahan_(photographer) )
“In every pose. Rain or shine. And whatever I was doing. If I was doing the dishes or if I was half asleep. And he knew that I never, never said no. I was always there for him. Because I knew that Harry would only do the right thing. I never had any fear. Harry could do whatever he wanted with me and my body.” (Eleanor Callahan). http://silentbeings.tumblr.com/page/20
Date and title from http://www.mocp.org/info.php?s=Harry%20Callahan&t=objects&type=all