The male Charizard's from Nintendo's Pokemon, the female Flamedramon's from Toei's Digimon and this screenshot's taken from Valve's Garry's Mod.

Even though this Charizard dude's quite a ladies man, he challenged the Flamedramon lady to test out which of their bellies are the most draconic yet by respectivly storing up their Fire Blast and Fire Rocket and begin bumping their extremely inflated, tight and bouncy stomachs. But, the question is: Who shall prevail?