A woman in a black tank top and a man in an orange shirt sit their backs to the camera.
The man and woman did not want their pictures taken and turned their backs to the camera.
Just because their backs are turned does not mean they did not want their pictures taken.  They may have really wanted a picture of their backs.
exists p1 s1 s2 x1 x2 x3 x4 x5 x6.(n_camera(x6) & a_topic(s1) & subset_of(x4,s1) & exists e1 x7 x8.(in(e1,x7) & n_shirt(x7) & of(x7,x8) & n_orange(x8) & Actor(e1,x5) & v_sit(e1) & to(x5,x6)) & n_back(x5) & of(x5,x1) & n_thing(x1) & that(x4,p1) & n_man(x4) & subset_of(x1,s1) & in(x1,x2) & n_top(x2) & of(x2,x3) & n_tank(x3) & a_black(s2) & Theme(s2,x2) & n_woman(x1))
exists x1 x2 x3 x4 x7 x8.(n_camera(x8) & n_back(x7) & of(x7,x2) & n_thing(x2) & n_thing(x2) & n_picture(x4) & of(x4,x2) & n_woman(x3) & n_man(x2) & subset_of(x3,x1) & subset_of(x2,x1) & -exists e3 e2 e1 x5 x6.(Theme(e3,x4) & Actor(e3,x1) & v_want(e3) & Recipient(e2,x7) & Theme(e2,x6) & v_turn(e2) & to(x7,x8) & (x4 = x6) & Theme(e1,x5) & v_take(e1) & (x4 = x5)))