When I was in NTU (and that was a long time ago), couples are
more "silent" and I don't remember hearing any moaning or anything.
I do pet with my then gf but only when we are alone in the room,but
never with my roommate around. But most roommates are very
"automatic" and will leave the room when their roommate brought a
partner back to the room.
Long time cohabit also have, but is really very vey rare during my
time. More of the exception rather then the norm.
Can see high heels in guys' floor and guy's shoes in gals floor
outside the room with door close... but no moaning noise !!
During my time, mostly couples doing it, don't have anyhow anyhow .
Not sure about now.