Incest is wrong because it confused the relationships.
That's why in chinese it is called "huan lun".
For example, father have sex with daughter, had children as a
result... should children address him as grandfather or father ?
what about daughter , can she be addressed as mother or
sister?
And what is her relationship with her mother now that she had
sexual relations with her father?
The children , resulting from incestuous relationships will be
either gifted or mentally retarded ( accoring to some reports) .
Either way, they will be socially criticised..
BTW, is the incestuous lesbian relationship between sisters,
mothers and daughters, and aunties and nieces acceptable?