Memories about these, cravings that unsettle. So not an aesthetic, but the sensation of seeing, touching. Vampires were incidental as it turns out, they were usually involved but as seductive instruments of a sensually paced nightmare it was always, nowhere else more obvious than here and perhaps Night of the Hunted, about the ephemeral wandering.
Naked bodies, blood, he approached these from the indulgent standpoint of a connoisseur. I believe Rollin just happened to articulate in terms of horror.