I picked this answer because it went into detail about different motivations for asking. I hadn't considered at all that it was a mere social nicety. I've never been in the opposing situation and didn't know at all that it was common. Knowing that most likely, because I'm in the US, there's not likely to be a very serious desire to see the photos makes it a lot easier to feel okay about insincere assurances that things'll happen later, but the answer is also very clear about what to do if there really is serious intention. Thanks so much. — friendly 42 secs ago