PenitentWoman and Tel have the best reply.
Does he look like he is from a particular "tribe"? I am not kidding.
My reply:
Why would you want these college girls? I'm serious. If you believe yourself to be someone of quality, why would you want to pollute your reality with young women who attend frat parties? You are completely unlike modern guys in a good way.
Not to be offensive, but to simply use these frat party girls would be better for you and your future family than to see yourself equal to them. During the Middle Ages, prostitution was allowed based partly on this. You love an honorable woman - your wife, you sin with a dishonorable woman and be done with it. I am in no way telling you to sin, simply explaining how it can effect you. I would not recommend this for many of these young women have STDs, apart from moral reasons. Which a debate can be had elsewhere, which is worse?
If he knows so many girls and you desire to seek a near equal, ask him if he knows any nice quiet shy girls and perhaps become good friends with her. Don't see her as someone to necessarily start a relationship with - a Christian courtship, but as a friend who you can learn about the way young women can be and she can learn how a young man can be. There may be some girl at the college who needs a good Christian influence.
Being paid for taking notes and helping out is ok. Doing assignments for him? Tell him he is there to learn, you can tutor him, *help* him outline and research papers, teach him to write the papers and you can review and assist in revising them so eventually he can do much of it on his own.
If you do follow anything I write, except the sleeping with frat girls (I was making a point), be strong willed about it. Don't be rude, just know your Christian position is in the right. These positions are more than simply Christian, it is the way you become and remain a man.