Calufrax

Story: From the First -- Oh, Those Human Women!
Author: Sigyn
Rating: Teen, some adult themes
Word Count: 7,214
Author's Summary: As the 10th Doctor considers his possible future, or lack thereof, with Martha Jones, he is drawn to remember his very first human lover -- the Aztec woman Cameca. What is it about human women? Assumes familiarity with Gridlock and general NuWho history.
Characters/Pairings: The Doctor (10th), The Doctor (1st), Martha Jones, Cameca, Brannigan, Valerie
Warnings: As the author notes - sex scenes, but nothing graphic.

Recced because: Typically, sex scenes tend to make me blush and hide like an eight-year-old under the duvet. If they're tastefully done, I can dig 'em - I may be immature, but stronger stuff lurks beneath!

Anyhow, this is one of the best stories I've come across where sexual themes are the main focus of the plot. The First Doctor, by most accounts not the first to pop into mind where such scenes are concerned, manages to be delightfully accurate and adorable. Cameca is feisty. Martha cuddles kitten-babies. Kitten-babies. One of my favourite fics on Teaspoon.