How I Met Your Mother Wiki

The Mermaid Theory (theory)

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Robin as a manatee (becoming a mermaid) to Marshall.

For the episode revolving around this theory, see The Mermaid Theory.

The Mermaid Theory is the theory that a man will eventually want to sleep with any woman after a period of time, no matter how initially repugnant. The only way that a woman who will become unattractive again is pregnancy and becoming mermaid again is possible by breastfeeding.

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