Three college girls were waiting in line at the doctor's office to have their yearly checkup. The doctor stuck his head out the door and called, "Next!"

The first girl went in and the doctor asked her to remove her shirt. The girl did so and the doctor saw an "H" mark on her chest. The doctor looked at her and asked "Why is there an H on your chest?"

The girl replied "Well, my boyfriend goes to Harvard and he never removes his sweater. He always has it on, even when we are making love."

The doctor shrugged and left it at that. After a while, the doctor called again, "Next!"

The second girl came in and removed her shirt. The doctor this time saw a "Y" on her chest. He asked "Why do you have a Y on your chest?"

The girl replied, "Because my boyfriend goes to Yale and he keeps it on all day, even when we are having sex."

After a while, the doctor called in the last girl. The girl removed her shirt. The doctor saw an M on her chest this time and he said, "Let me guess, your boyfriend goes to Michigan."

The girl looked at him funny and said "Umm...no. But my girlfriend goes to Wisconsin."