Watch out, Princess Leia! You’re not the only one who can sport a gold bikini and dance with aliens. A new brothel will open outside Las Vegas – and it’s catering to sci-fi fans. After all, what’s more seductive than a green woman with three breasts? So, how common is the sci-fi festish? Why is science fiction so appealing sexually? And what’s the likelihood an alien brothel will succeed? Sex columnist Dan Savage weighs in.