The whole issue of scandal has got me thinking about the basis for it. Most every other moral precept is founded on objective truth: It is wrong to have sex without marriage, etc. But scandal is founded on subjective appearances: It looks like those two are probably having sex.
So scandal is more about what others may assume than about what is actually going on. So how is the standard set for what constitutes scandal? Should it be set so high that no one would ever assume something illicit is going on? That is an impossible standard to achieve, for there will always be synical people who will assume something illicit is going on. For example, two young people are engaged and attending college. They live in the same dormitory, but on different floors. They are living chaste lives, but their friends may assume they are sneaking over to each other’s room to have sex. And statistically speaking, those friends would be correct. Most (secular) engagements under those circumstances would be accompanied by pre-marital sex. So should these two fine people change dormitories? Even then some people will assume they are having sex. Should they change colleges? Or one of them drop out? It is apparent that at attempt to place the possibility of illicit activity beyond anyone’s imagining is just not reasonable. So the standard for determining scandal must be set somewhat lower.
Other examples for non-scandal have been given in this thread, e.g. the quadriplegic. Or consider the case of an unmarried couple in their 80’s. How many people would assume they are having sex?
On the other hand, it is supposed to be permitted for a brother and sister to live together. Yet that could also be an occasion for scandal, especially if the two are in their twenties and are not showing any romantic interest in anyone else. Many people would think that perhaps they are engaging in inscest. So why should there be a cohabitation exception for bother and sister?
A more reasonable conclusion would be that hard and fast rules about scandal must give way to case-by-case considerations involving all the details of the people involved.