I agree - in my city as well, where the cost of living is very high, it is extremely common for young men and women who are NOT and never would be romantically involved to share a house or apartment (with separate rooms). I’ve spoken with priests who agree that this is not necessarily sinful…so I will take the dogmatic pronouncements of the laity on this board with a grain of salt. It is frankly very insulting to assume that it is always a near occasion of sin for a man and woman to be in the same house…are we monkeys or something? It is no more an occasion of sin than for friends of the opposite sex to visit one another in the evening…is that also sinful? In some cases, between certain individuals, yes there will be temptations - but not every female/male coupling automatically equates to sexual temptation. In terms of scandal, if male and female roommates who are not sexually involved is one of the norms of the society in which you live (as it is in my case), where is the scandal? If you tell people that you are roommates with separate rooms and not a couple, they aren’t going to question you - why would you lie? Scandal is culturally informed, and St. Thomas Aquinas was writing within the context of a very different culture than 21st century North America.