I know they wouldn't try this stuff if it didn't work on some unsuspecting souls out there. If you don't know by now, any message (whether by email, instant messaging, social networking or other communication medium) that promises to show you porn if you only download an executable file (either claiming to be the porn itself, or a codec enabling you to view the porn) is almost certainly malicious. Case in point, the last 10 files captured by Minotaur's maltweet/exetweet engine.

For that matter, be weary of any executables sent to you in such messages. And if you ever have a question on if a file is malicious, send it to a service like VirusTotal or NoVirusThanks to scan it just in case.