Fics like A to Z

Filled as part of this prompt by Anon: For some reason or other, our boys start talking about sex. Martin's experience is minimal (or completely non-existent), which surprises no one. Douglas has had a sexual encounter in half of the world's countries, which surprises no one. The real surprise is that Arthur has the busiest, kinkiest sex life ever, and he doesn't see why he shouldn't talk about it in explicit detail.

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