If you expand the field of view enough eventually there's going to be people having sex in it.
Not necessarily. If the camera and primary subject are in an enclosed room, all you're ever going to get is more wall.
Of course not, and its really worrisome that you think that. Most of the set of grey scale 50x50 pixel images are not crops by the simple fact that they contain no correlations at all, that's simple combinatorics.