Are you a virgin? It sounds like you want to get laid by a bunch of girls, but you feel like you'll only really get sex if you settle down with one. My modus operandi is too try and hook up with girls on the weekend, and then try and get a date later. I've had success with the hookups, but past that, not much has happened for this semester. If it continues to fail, I'll try pulling girls to my house the same night, and even if there's no sex then, they'll be much more invested having entered my house - they're usually with their dormmates though, who can be pretty protective. An alternative is inviting girls I've met during the day to parties, but I haven't done much of that.
Girls usually want to hookup a couple times before they have sex with you. And they may not want to go out of their way to meet up with you when they can go to a party and get their pick.
Here's my frat party game: Get tipsy, go to a frat party, go ask the first attractive single chick you see on the dance floor to dance (read: grind) with you. hump from the behind for a song or two (I noticed this past weekend I'd try to turn 'em around too soon, and they seemed to think this was needy or sketchy - dancing front to front is harder too). Talk to them a little - I tried "[state of my school]?" because I'm from the opposite end of the country, and I tell them all the NEers look the same to me. It's honestly stupid shit, but they're drunk freshmen. Keep talking, turn her around at some point, grind some more, then go for the kiss. Kiss for a while, then tell her hey let's go to the bar and get some water. Do that, and then just talk to her, get her number, etc. I'm a horrible dancer, physically stiff, but it doesn't matter.
In my experience, sex in college is a lot less common than people make it out to be: "The 2004 University of Arizona Health and Wellness Survey of their student body found that 73 percent had one or fewer sexual partners. A 2001 study of students at Princeton University found that 79.3 percent of respondents had one or fewer sexual partners. A 1998 study of a "Midwestern commuter college" found 68 percent of sexually active respondents reported having one sexual partner during the previous year. Eighteen percent of respondents reported having had two partners. " (survey data for one year, not students' lifetime)
http://www.goaskalice.columbia.edu/0607.html
At University of Arizona, party effing central, the vast majority of girls have slept with 0-1 guys within the last year. Another 15-20% have slept with two guys. So you aren't a total loser if you're not banging chicks every weekend.
Maybe if you're in a top frat or on the football team, etc. it would be different.