"University Sweatshirts" joke

A girl goes to the doctor and takes off her shirt to be examined. On her chest
she has a huge red "H". The doctor asks, "How did you get that red 'H' on your
chest?" and the girl replies, "My boyfriend goes to Harvard and he's so proud of
his school that he never takes off his sweatshirt, even when we're making love."
So the next day the doctor has to examine another girl and she takes off her
shirt and has a huge blue "Y" on her chest. The doctor asks, "How did you get
that blue 'Y' on your chest?" and the girl replies, "My boyfriend goes to Yale
and he's so proud of his school that he never takes off his sweatshirt, even
when we're making love."
The next day the doctor has to examine another girl and she takes off her shirt
and she has a huge green "M" on her chest. The doctor asks, "Do you have a
boyfriend who goes to Michigan?" and the girl replies, "No, but I have a
girlfriend who goes to Wisconsin. Why do you ask?"