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I rolled back: Incest avoidance- 'Westermack effect- Siblings that co inhibite develop feelings of sexual aversion towards one another, this results in negative sexual imprinting. This influances thoughts and feelings of individuals and results in personal feelings that incest is wrong. Consequantly this causes incest to be viewed as toboo not just in individuals but by societies in genral. It is suggested that incest avoidance is an adaptive mechanism that improves fitness within a species by improving successful sexual reproduction.