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Trait: Incestous infidelity

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Imho, just using separate traits of Incest and Infidelity should be enough in this case.

Trait: Incestous infidelity

Traits > Engages in > Sociosexual Events > Infidelity > Incestous infidelity

Case, when character essentially commits infidelity with someone who blood-related to him/her. For example father having sex with his daughter or mother having sex with her son and other cases (uncle/niece, aunt/nephew, etc.)
Perspection of this act then varies depending on character beliefs! As beside straightfoward cheating, there are often also cases where they don't see act as cheating at all, but rather as mere sexual education of their children or form of bonding between family. This happens especially in case of mothers. In cases of fathers, it's more rare, but still possible. However in every case, they still act without knowledge or permision of their spouse.
Don't add tag, if spouse aware and fine with act.

Aliases
Incestous cheating
Incest adultery