Abstract
The estimates of incest prevalence differ significantly. These estimates might be influenced by the source of data (e.g., judicial records), but also by different definitions of incest.
Furthermore, it is not clear which factors are specific to the occurrence of incest. This review paper aims to present the occurrence of incest behaviour and conditions that typically accompany such behaviour.
First, we present the definition of incestuous behaviour and its intercultural variability depending on the kinship classification, including the variability of legal definitions. Second, we discuss the prevalence of incest behaviour in Western societies.
The estimation of incest prevalence in the population is complicated due to the sensitivity of the issue; nevertheless, the estimates of the prevalence are usually from 1 to 5 %. Men showing slightly increased pedophilic preferences and antisocial tendencies are the most frequent perpetrators of incest behaviour.
The families in which the incest behaviour occurs are often described as isolated and dysfunctional. However, none of the presented factors is specific for incest occurrence.
We conclude the study with a discussion of incestuous sexual preferences.