That sinking feeling after you blow your load, when you look at the porn you've been jerking off to and wonder why you got off on it. Usually applies to fetish orientated material.
The feeling usually subsides minutes later.
*spooge* "....Why the bloody hell did this picture of woman rubbing socks on herself get me off? Man I'm weird. I should throw this stuff out."
*5 minutes later*
"Shit, why did I throw that out? That picture was hot!"
The act of downloading a porn video, and while it is downloading you look at another video to jerk off to, after done you cancel the download and then later you wished you had it downloaded to jerk off too.
Me: Sweet I'm going to download video, i'm going to watch this in the mean time.
5 minutes later
Me: Alright I won't be needing to download this anymore.
6 hours later
Me: Porn Remorse