For me the hottest scenes are actually from movies and TV shows rather than porn. I find it’s because the characters are usually in love, and it’s well acted, and therefore the sex scenes are super intimate. Some scenes that I particularly like include the Bill and Sookie scenes from True Blood, the Anne Boleyn scenes from The Tudors, many of the love scenes from Spartacus, and the Nick and June scenes from The Handmaid’s Tale.
The scene isn’t therefore about sex for the sake of sex, but sex as a means of connection and love, and I find that incredibly sexy.
The other type of porn that I like is “romantic amateur” where real couples who are in love film themselves.
Fanfiction is also a great source for demisexuals.