Univeristy allegiance

During Spring Break, a doctor at a college campus is giving free physicals for one week only.
On the first day a girl comes into his office, and the doctor asks her to remove her shirt.
The girl proceeds and the doctor immediately notices a large A imprint in the middle of her chest.
The doctor asks, "How did you get that A on your chest?"
The girl responds by saying that her boyfriend goes to the University of Alabama, and when they make love, he likes to keep his letterman's jacket on.
The doctor finds this rather strange, but just shrugs it off.

On the second day he sees another girl and when she removed her shirt the doctor noticed a large I imprint on her chest.
The doctor asks, "How did you get that I on your chest?"
The girl tells the doctor that her boyfriend goes to the university of Iowa, and when they make love, he likes to keep his letterman's jacket on.
The doctor then begins to wonder if all college students keep their letterman's jacket on during intercourse, but just shrugs it off.

On the third day another girl comes in and she removes her shirt.
Sure enough, there is a large W imprint, but on the womens stomach.
The doctor, thinking he's quick on his feet, blurts out, "Let me guess, your boyfriend goes to the University of Wisconsin!"
The girl pauses a moment and replies, "No, my girlfriend goes to the University of Minnesota..."