Others are clearly staged, and made to look like the sex is totally happening in the heat of the moment. Some are legitimate behind the scenes movies (NSFW) in which the sex you’re watching is simply shot by another cameraman on the set.
In BTS porn, viewers get to feel like voyeurs as they watch the actors and actresses having sex in between shots, or after their scenes have supposedly ended. One genre that straddles the line between reality and fantasy, however, is behind the scenes (BTS) porn. (And yeah, FYI, guys, most ladies don't love that.) Most housewives, for instance, don't answer the door for pizza delivery guys wearing heels and sexy lingerie similarly, most guys can't have sex for hours uninterrupted before loudly ejaculating on a woman's face.
Even the most hardcore porn devotee knows that a lot of the stuff we see onscreen is the stuff of fantasy.