Go with Julie

You could exploit the girls as they get drunk, but you're too much of a nice guy to do something like that. Why would you though, you are already hitting it off so well with Julie.

"I'd rather not hang out with a bunch of drunk people, no offense to your friends."

"None, taken. I feel the same way." You both head to her room and get comfortable. You find out Monica is her roommate and they just met last year. That this is the first time she has much independence and she doesn't really have any other friends in the area. You two keep talking and snacking for a while, what seems like hours. Until you are finally interrupted as the door bursts open and Monica and Jill both stumble in, drunk. "Hey lovebirds, we're not interrupting anything are we?" Monica insinuates.

"No, we're just talking." Julie replies

"Talking eh? Did you tell him about the dream you've been having?"

"Monica stop talking right now and get out." Julie snaps back.

"I don't think she told him" Jill says

"No, Now shut-up!"

Monica turns to you and blurts out,"Someone has been having a recurring fantasy about taking a shower in the dorm, an older stranger joining her and breaking her cherry. It's really quite slutty of her."

"That's private! I can't believe you just said that." Julie hides her face in her hands.

"I didn't say who it was, but now he knows for sure sweetie." Monica taunts.

"If she's not going to, can we play with him?" Jill asks, leering at you.

"If he wants." Monica says, "Bring him to your room though."

"Okay, come with me John..."

Here is your shot, you might even get two chicks if you go with the drunk girls but you've really been getting along with Julie, you might even like her, not to mention she must be really embarrassed by her friends right now. Staying could score you some major points with her.