This is a comment from someone who has no clue. Log onto your email (or other e-product, particularly social media) over the open wifi at your work, college, coffee shop etc, and that can be it - account compromised. If drivenbyboredom doesn’t believe that then they can very easily google step-by-step instructions on how to carry out such an attack, and even try it out if they feel like. Or simply set-up honeypot accounts and log into them over open wi-fi, see how long it takes. It’s unfortunately both incredibly easy and incredibly common. Add to that the plethora of threats you can encounter online and it just isn’t ludicrous.
And those are random attacks, some of these women have been targeted. I can’t imagine that I wouldn’t be able to gain access to the account(s) of anyone I work with for example - and I’m not a hacker.
Besides that drivenbyboredom seems to infer that if you ever sent such a photo to anyone then you deserve what you get, and/or that having your life destroyed because of one is somehow less of a crime if you once took a photo with a nipple showing - that goes beyond technically illiterate and well into morally despicable territory.