Sci-fi Ponderings

Although I am not a "nerd" I do enjoy some science fiction television on occasion.  Star Trek: The Next Generation is one of my favourites, because it shows us Mister Roddenbury's ideal world full of peace, harmony, and cooperation!!  Also, Deanna Troi is quite attractive to look at.

However, I am always left with one lingering question:

When the various members of the Enterprise-D set up their favourite simulations on the Holodeck, they can bring to life beautiful landscapes and sunsets, attractive women, the Wild West, and even Stephen Hawking!!

So why are there no unicorns on the Holodeck?

I can only imagine that any human, when told "This place can create anything you desire" would automatically leap to the thought: "Finally, I shall ride a unicorn!!"  (We are extremely attractive creatures, you see.)

But yet there are no unicorns on the Holodeck.  A mystery for the ages!  (Also, when a male crew member has sexual intercourse with one of the Holodeck's fake women, where does all of the ejaculated semen go after the holograms vanish?  The Holodeck is clearly a mysterious place!!!)