I know there would be psychological effects...
''A study of victims of fatherdaughter incest in the 1970s showed that there were "common features" within families before the occurrence of incest: estrangement between the mother and the daughter, extreme paternal dominance, the mother's inability to fulfill her traditional parental role, and reassignment of some of the mother's major family responsibility to the daughter. Oldest and only daughters were more likely to be the victims of incest. It was also stated that the incest experience was psychologically harmful to the woman in later life, frequently leading to feelings of low self-esteem, unhealthy sexual activity, contempt for other women, and other emotional problems.
[34][
clarification needed (needs a better source)]
Adults who as children were incestuously victimized by adults often suffer from low
self-esteem, difficulties in interpersonal relationships, and
sexual dysfunction, and are at an extremely high risk of many mental disorders, including
depression,
anxiety,
phobic avoidance reactions,
somatoform disorder,
substance abuse,
borderline personality disorder, and
complex post-traumatic stress disorder''
But of course you will pretend all incest is entirely mutually reciprocated.