A few images help illustrate issues of consent and privacy. They do not resolve those issues.
Above left: Bridge of Sighs, Paris, 2010 Above Right: Place des Vosges, Paris, 2010
Bridge of Sighs depicts a frequently repeated scene in Paris. Privacy was probably an irrelevant consideration to this couple.
Place des Vosges depicts jeunes filles walking home, probably after class or maybe work, through the Place des Vosges, one of the most pleasant locations in Paris. Would they have been concerned that their picture was being taken? If it had been a surreptitious act, perhaps, but there was no attempt to hide the full-frame DSLR and big lens.
A different question inherently arises when children are the subject. The Young Girl sat at a nearby table in Rome with other family, including a grandmother. I took several pictures because she was so fresh and radiant. Maybe attitudes in Rome are a little different. I didn't try to hide the camera. but I didn't ask consent, either.
Young Girl, Rome, 2012
Tiber Jazz, Rome, 2012
The saxophonist was openly playing jazz beside the Tiber, beneath a bridge. He wasn't trying to be private.
Child with Umbrella, Cannon Beach, 2012
The child was with his mother, who may have been taking snapshots of him. He wanted to do something else, and not be on the beach, and was howling. So was the wind, driving sand and spray and some drizzle at him. He did well to keep the umbrella from being blown away or inside-out.
After a lifetime of mainly expressing myself with words, my postings here will mainly rely on images. They will speak for themselves to some extent, but I'll usually add a few comments of explanation. I've taken photographs for decades, since the 1950's, inspired in part by my father's photographic skill. Four years of photo assignments and quality darkroom time eventually gave way to decades of casual and family picture-taking. I re-immersed myself when I left film and turned to digital.