DD (20) and her boyfriend (19) are at the same uni and have been together for 18 months. He lives at the opposite end of the country to us so whenever he visits during the holidays he stays for a least a few nights, and right from his first visit we put him in the spare room. Since I am sure that they are sleeping together at uni, am I being ridiculously old fashioned by not letting them share a room now they've been together for a substantial amount of time?