I'm sick of people, so I'm not going to read the inevitable comments that are going to come. Look, face it, some people like taking nude photos of themselves and they like sharing them with their partners. There is absolutely nothing wrong with this. It's not their fault if something like this happens. People should be able to feel secure in the tech that they use, in the companies that they entrust their information…
I don't take nudes but I tend to use my phone as an impromptu photocopier for stuff like bills and receipts, so the photos are full of private info such as account numbers. I worry about that sometimes. For photos that have to be treated with real security (typically the screen of recovery codes when enrolling a 2FA token), I use my old dedicated digital camera which has an SD card, no network connection, and never leaves my bedroom.