The doctorsA woman goes to the doctor with chest pains. He asks her to take off her shirt so he can examine her and sees a big letter H emblazoned on her chest. He asks what is all about and she explains that her boyfriend is from Harvard and he loves the place so much that even when they make love he insists on wearing his harvard t-shirt and the H just rubbed off.
A few days later another girl went to see the doctor with a similar complaint. Upon examining her he found a large letter P on her chest. She explained that her boyfriend was at princeton and insisted on wearing his t-shirt during sex.
A few days after that another girl went to see the doctor. Upon examing her he found a large letter M on her chest. Getting clever by this time he said - ahh, don't tell me, you have a boyfriend at Milwaukee. No she said, a girlfriend at Wisconsin.