Arcane or occult pornography involves sexualized situations with an occult or magical tone or performers who costume themselves in keeping with the theme.

Wetlook pornography involves clothed wet persons.

Boot pornography includes women and sometimes men wearing boots for their sexual appeal.

Yiff or Yiffy pornography features "Furry" or anthropomorphic animals in an erotic or sexual context.

Guro is a genre of Japanese pornography involving simulated gore, disfiguration, violence and mutilation.

There's also head shave fetish porn.

Tentacle erotica features tentacled creatures.

Porn that features participating actors crying.

Facesitting.

Emetophilia porn involves vomiting.

Pegging features a woman doing the man's work.

Paraphilic infantilism pornography involves performers wearing... diapers. Often with somebody acting in the role of a "caretaker."

There is a pregnant performer fetish.

Dwarfs or midget pornography features performers who are dwarfs/midgets.

Exhibitionist pornography features performers exposing themselves in public.