Okay, how about this one
A new Polish Army Captain is assigned to the Quisqueya squad in a remote post in the Iraqi desert.
During his first inspection, he notices a burro hitched up behind the mess tent. He asks the Dominican Sergeant why the burro is kept there. "Well, sir," is the nervous reply, "As you know, there are 50 men here and no women. And, sir, sometimes the men have...m-m-m.... urges. That's why we have the burro, sir."
The Polish Captain says, "I can't say that I condone this, but I understand about urges, so the burro can stay."
About a month later, the Captain starts having a real problem with his own urges. Crazy with passion, he asks the Dominican Sergeant to bring the burro to his tent. Putting a stool behind the burro, the Captain stands on it, pulls down his pants, and has wild, insane sex with the burro. When he's done, he asks the Sergeant, "Is that how the Dominicans do it?"
"Uh, no sir," the Sergeant replies. "They usually just ride the burro into town where the girls are."
apologies to all of those from whom this joke was stolen