Well, that is 5 more than I have seen. Though, as I understand you need a strong stomach to watch some of these, especially Salo. You could actually come up with 10 films just by Ken himself. Maybe not all of these are great, but they are about sex in some small part or the other. Including Crimes of Passion, they'd include . . .
01. Women in Love
02. The Music Lovers
03. The Devils
04. Valentino
05. Crimes of Passion
06. Gothic
07. Salome's Last Dance
08. The Lair of the White Worm
09. The Rainbow
10. Whore