Poor Girl! If she was smart enough to be at Harvard, one would like
to think she wouldn't be this stupid! This actually happened at Harvard
University in October of last year. In a biology class, the Prof. 
was discussing the high glucose levels found in semen. A young female
(freshman) raised her hand and asked:

   "If I understand, you're saying there is a lot of glucose, 
    as in sugar, in male semen?" 

   "That's correct", responded the Prof. 

Raising her hand again, the girl asked: 

   "Then why doesn't it taste sweet?" 

After a stunned silence, the whole class burst out laughing, the poor
girl's face turned bright red, and as she realized exactly what she 
had inadvertently said(or rather implied), she picked up her books 
without a word and walked out of class...and was never to return. 
However, as she was going out the door, the Prof.'s reply was classic.
Totally straight-faced he answered her question, 

   "It doesn't taste sweet because the taste-buds for sweetness are
    on the tip of your tongue and not the back of your throat."