Authors and scriptwriters have to some extent exploited parasite biology: lifestyles including parasitoid, behaviour-altering parasite, brood parasite, parasitic castrator, and many forms of vampire are found in books and films.[32][33][34][35][6] Some fictional parasites, like the deadly parasitoid Xenomorphs in Alien, have become well known in their own right.[7] Terrifying monsters are clearly alluring: writer Matt Kaplan notes that they induce signs of stress including raised heart rate and sweating, but people continue indulging in such works. Kaplan compares this to the "masochism" of liking very hot spicy foods, which induce mouth burns, sweating, and tears. The psychologist Paul Rozin suggests that there is a pleasure in seeing one's own body react as if to stress while knowing that no real harm will result.[37]