Just a Spoonful of Sugar

During a college lecture, the professor was explaining how seminal fluid contains fructose, fatty acids, and proteins to nourish the sperm. A young student raised her hand and asked “If I heard correctly, you’re saying there is fructose in male semen? Like, as in sugar?”
“That’s correct”, responded the professor, as he went on to add more statistical info.
Raising her hand again, the girl asked, “Then why doesn’t it taste sweet?”
After a stunned silence, the room burst out laughing. The poor girl’s face turned bright red as she realized what she had inadvertently said (or rather implied). She frantically picked up her books and started to scurry out of the class.
As she was going out the door, the professor nonchalantly replied, “Maybe 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.”