While laying into some sweet pussy from behind, a male will ravage his female companion sharply in the rectum. The noise she immediately produces is known as the Dolphin's Cry.
It is easy to judge the character of your broad by this action. If she accepts the anal attack, you can bet your broad gets around (or just really loves it in the ass), yet if she denies, she's a prude. Not to stereotype, or anything. You're looking for an immediate rejection, followed promptly by acceptance.
"Dude, I was fuckin my girl last night and i accidentally slipped it in her ass...hard"
"She made this noise...like....a....a..."