But in this case it was effectively a father/daughter relationship, albeit adopted rather than biological and that does make a difference, particularly since the girl, if I remember rightly, was still in her late teens when the relationship began.

Allen was her parent and, as such, had special responsibilities to his child and this new relationship left a nasty taste in the mouths of many people. From its nature it had a tinge of abuse at the time that concerned a lot of people.

There is a lot of fuss when a teacher/pupil relationship is uncovered, even if the pupil is above the age of consent, how much more so when a parent/child relationship occurs, be they biologically linked or not?