The phrase "long-porn" seems to be a combination of the words "long" and "porn." In this context, it appears that "long" is referring to the duration or length of a pornographic video. Therefore, "long-porn" could be interpreted as "extended pornography" or "lengthy porn videos." These types of videos tend to have longer running times compared to typical porn content. They often encompass various scenarios and sexual activities that provide extended visual stimulation for adult audiences who enjoy watching more elaborate storylines and lengthier scenes.