"Certainly. Is so simple that, once you understand, you’ll never be in danger from it again. Here we are, two million males, less than one million females. A physical fact, basic as rock or vacuum. Then add idea of tanstaafl. When thing is scarce, price goes up. Women are scarce; aren’t enough to go around—that makes them most valuable thing in Luna, more precious than ice or air, as men without women don’t care whether they stay alive or not. Except a Cyborg, if you regard him as a man, which I don’t."