Intraclass dating has its pro's and its con's:
Pro's: Its easier to see each other, u both understand the "med school grind," and study breaks can be "lots of fun."

If u find the right girl/guy, it can be heaven.
Cons: Everyone knows your business if u break up, u can end up spending TOO much time together, and coordinating study schedules can get irritating ( eg. 1 of u likes to go to lecture, then study, sleep at 10, while u may ike to sleep till 11, study and b.s. till 8, go to the gym, watch some TV, sleep at 2 etc. ) and if u dont study together the whole easier to see each other thing gets shot out the window. I dont recommend random hook-ups, med school is a small place, and if things go bad, everyone gossips/people may hate u, and its just not worth it, there are lots of other "random people" to randomly hook up with.
However, it all varies on a case by case bases. I'm a 3rd year whose engaged to a a girl in my class, who I dated throughout med school. I guess for me it worked. I hope u get as lucky as i did, and find the girl of your dreams at school. Good Luck.