"I had to actually say to her, 'Do you realize this is cheating?'"

Even when committed couples are zinging photos back and forth, Blake offers words of caution. One client, a 55-year-old woman, was sexting happily with a boyfriend who traveled a lot, sending photos with messages like, “Missing seeing you.” Then the woman had a problem with her cellphone and took it to a store for help.

“When she tried to show the technician what was happening,” Blake says, “this body part showed up on her screen. It was very embarrassing to her!”

Blake’s advice, for ordinary sexters and high-profile politicians alike: delete, delete, delete.