Most sex in college is from hook-ups. I would use daylight hours to talk to as many girls as possible, but not hit on them. Then when you go out at night, you will run into them, usually after they have been drinking. Women who want a one-night stand are much more comfortable with a guy who is not a total stranger - she at least has met you previously.
Also, I think it is worthy of mention, given our current political climate, that you need to be very discrete about hitting on girls when on campus. Mostly you need to pick up on indications of interest, and especially disinterest. It's fine to talk to a girl if she is liking it. But if women feel like you are harassing them, they will run and cry to the school's administrators, who will expel your ass before you know what hit you. We can complain about the politics, but from the school's perspective, that is a business decision. Daddy's little angel/slvt needs to feel safe, so Daddy will keep sending that tuition money. I'm not trying to scare you out of talking to girls, just be aware of the larger picture of what is going on in society right now.