In my life I've had two girlfriends who routinely shared photos of me with their friends. This was before the days of the internet, so it was a question of them showing actual physical photos. An example of each would be:
One girlfriend was having lunch with a friend she hadn't seen in a year and who had never met me. She waited until they were at the restaurant, her friend was just about to drink from her cola, when my girlfriend asked if her friend wanted to see some photos of me. Her friend said "Yes", and my girlfriend reached into her pocketbook, waiting until her friend was in mid-swallow of the soda before she spread out four or five photos of me nude and masturbating across the restaurant tabletop -- causing her friend to shoot soda out through her nose in her gasped reaction.
Another girlfriend was a nurse who liked taking nude/masturbatory photos of me and created a montage of those photos on the inside of her locker door in the nurses' dressing room in the hospital she worked at to share them with her fellow nurses.