A pretty woman goes to a doctor for a physical.  When she undressed
he was shocked to observe a large letter "Y" imprinted on her body.

She explained: "Well doc.. my boyfriend and I got kinda hot-and-heavy
last night and he couldn't wait to get his college sweat shirt off..
You see he goes to Yale and the paint from the letter "Y" on his 
sweatshirt melted onto my body..

A few days later another woman came in with the letter "H" imprinted
on her.  This time the explanation was that "H" was for "Harvard".

A few more days later a woman showed up with the letter "M" imprinted
on her body.  Doc being a quick learner, observed:

"Let me guess, your boyfriend goes to the Univ of Maryland" 

to which the woman replied:

"Well no, but my girlfriend goes to Wisconsin"...