Civilian vs Military
The female sex champ of San Bernardino, undefeated in over thirty challenges to her title, issues a challenge to a nearby Marine training base.

Four hours in, with him having cum 5 times and her an even dozen, both are still in the game. There is one difference though - it looks like she’s trying to conserve energy. He’s still fully at it.
Her relative lack of stamina becomes more apparent in the next two hours, and even though she gets the Marine’s gun to fire a couple of more times, ultimately it’s her calling for a surrender to superior forces.
The final score is 18 to 7 and the soldier takes a figurative victory lap using her body for one last climax.