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 as much glucose in male semen as there is in
sugar?"
"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 he class.... Never to return.
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 the tongue and not in the back of
the throat".