A girl's asshole is like a fortress: some times they have elaborate defenses set up, others have the drawbridge lowered before your armies get there. You can't always charge in with your infantry each and every time. Some times you have to be a little sneaky like a spy. But there are times when artillery is best bet for breaching those defenses, and these girls want those walls torn down. Yes, it might hurt a bit when you start pummeling those walls with the brunt of your forces, and yes, she might scream a bit when the head shoves through the gate. But these sultry bitches love a little pain. As a matter of fact, they like a lot of it and want their walls razed to the ground and your sperm platoons to line the caste walls.