When watching a porno or having sex anything can seem sexy but immediately after ejaculating it all of a sudden seems a little gross. You might even feel a little guilty.
"Dude, I was totally fapping to these chicks swapping cum on Pornhub but right after I came I was like, wow, this is actually not sexy at all. It's a little disgusting, actually. I had a serious case of cummer's remorse."
1) A sense of regret after an orgasm that results from the physiological crash combined with a wave of guilt for taboo desires that were eagerly acted out during the pre-orgasmic high.
Jeff was eager to obey every humiliating direction, but after he jizzed he got cummer's remorse and immediately turned off his webcam.
Carl made a lot of promises to get the blowjob, but once he came he had cummer's remorse and recanted them.
2) Steve was overwhelmed with excitement and shot his wad, but experienced cummer's remorse when he saw the unquenched desire that remained in his lover's eyes.