Also, what do you think of SBCC and UCSB relationships? Is that pretty normal?
Nobody will think anything of it; in fact, until you tell them nobody will know. A girl on their floor is hanging out with some guy, they'll just figure he's one of the 18K other students at UCSB they haven't met because he's not in their classes. But I don't think they're that common (UCSB and SBCC relationships) because you meet most people thru your classes and dorms; you make friends in class and in your dorm, meet their friends, meet people at dorm parties, etc. And SBCC students tend not to be in these circles.
What I do have empathy for is your GF's future roomate(s). Where are they supposed to go overnite while you are playing bunny? They're paying just as much as your GF for the room, and they're just as entitled to sleep there undisturbed by X-rated sounds 5 feet away. Most people manage to work out private time with their SO, but it often involves a few free hours and not spending the nite. Also if I was one of the roomates I'd have a rule that while GF is out of the room, so are you; its not your place to hang out while you're on the UCSB campus if she's in class.