Right. And why would James be stupid enough to send a nekkid pic to his present fling?

Users do not read anything. They just get excited that a) they received email b) it has an attachment, therefore must be legit c) oh, it's a picture of someone naughty.. should I? shouldn't I? No one's looking... <insert evil grin here> ... Let's see who screwed up sending this email out..

It doesn't surprise me that people would open this email in many ways. Yes, they should be more careful. Yes, they should read the fine print.

But they don't. They don't care. They are curious. They want to gossip about "James" in the office who's involved with some chickie named "Mary" and another named "Wendy". Human nature is to be a rubbernecker.