Arkdragen frowned. "I wouldn't recommend it for a first visit."
"Why not?"
"Dreams of Earth are apt to be more unsettling than any imaginary productions. It's usually advisable to build up a tolerance for them. I would advise a nice little sexual fantasy for your first visit. We have a special sale on sexual fantasies this week."
Barrent shook his head. "I think I'd prefer the real thing."
"You wouldn't," the assistant manager said, with a knowing smile. "Believe me, once one becomes accustomed to vicarious sex experiences, the real thing is pallid by comparison."
"Not interested," Barrent said. "What I want is a dream about Earth."
"But you haven't built up a tolerance!" Arkdragen said. "You aren't even addicted."
"Is addiction necessary?"
"It's important," Arkdragen told him, "as well as being inescapable. All our drugs are habit-forming, as the law requires. You see, to really appreciate a drug, you must build up a need for it. It heightens pleasure enormously, to say nothing of the increase in toleration. That's why I suggest that you begin with—"
"I want a dream about Earth," Barrent said.