Biology Class

   In a biology class, the professor 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 professor, going on to add statistical
   info.
   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 never returned.
   However, as she was going out the door, the Professor'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."