"Sexual drives are core aspects of human functioning, but the quantity and quality of sexual behaviors show high variability across individuals. Pornography use has become a normative behavior among adults, and individuals show differences in quantity/frequency measures of consumption. Considering the broad spectrum of “normal” sexual behaviors and the finding that the number of people with NPHFU is 3–6 times larger than the number with PHFU, pornography use may be linked to adverse health measures in a minority of adults."