To the OP: Get your mind off of his dick, and your head into your books....
I totally agree with DrDante. Keep the studies as the first priority. And since it sounds like you have a real man-crush on this guy, you should find a different study partner--
a real one; and preferably someone who gets straight A's that you find totally unattractive. What he'll lack in eye candy, you'll make up for in good grades.
Regarding your man-crush, see if he has a blog or facebook page and check it out-- his interests, fav movies/music, comments on his wall, etc. Also, look at his FB pics and friends list. Are there more guys than girls? Is it mostly friends, family or loves.
At your next "study session" talk to him casually about one of his interests or something you have in common. See where that conversation goes, and use that as a way to do something social-- a campus lecture, a football game, a movie, tennis or running together. Afterwards, go for pizza and talk some more. Believe me: once you start hanging out with the guy, you'll either want to know him more, not at all or just be study partners.
My advice: He may (or may not) be worth the effort or risk. So, don't be too pushy until you know a little more about him.
Good luck and keep us posted.