The co-ed was in her doctor’s office for a checkup. When she took off her blouse, he noticed a red “H” on her chest. “How did you get that mark on your chest?” asked the doctor. “Oh, my boyfriend goes to Harvard and he’s so proud of it that he never takes off his Harvard sweatshirt, even when we make love.” A few days later, another co-ed came in for a checkup. When she took off her blouse, the doctor noticed a blue “Y” on her chest. “How did you get that mark on your chest?” he asked. “Oh, my boyfriend goes to Yale and he’s so proud of it that he never takes off his Yale sweatshirt, even when we make love.” A few days later, a third girl came in for her checkup. When she removed her blouse, he noticed a green “M” on her chest. “I assume you have a boyfriend at Michigan?” he asked. “No,” said the girl, “I have a girlfriend at Wisconsin. Why do you ask?”