"Is that a...?" asked the younger archaeologist.
Layla pointed out the tell-tale features. "I've only seen pictures in books of those strange bits they had, but... I'm pretty certain."
Maria scratched her head. "I never really quite understood – what was their purpose?"
Leyla reminded her that sperm banks were only invented in the late twentieth century; the pair shuddered and giggled at the thought.
"Apart from that, not much," said Leyla. "When everyone realised the world was overpopulated, the solution was obvious."