Infernal, in the context of a porn video tag, can be seen as describing content that involves intense or dark sexual themes, often evoking images of hell or the underworld. This may include BDSM, fetish play, or taboo scenarios. It suggests that the video contains content that might be considered extreme or edgy by some viewers, and may appeal to those with a particular interest in exploring these types of fantasies and power dynamics in their porn consumption.