It's all about the character. If you're character's a typical teenage guy in a bad situation (some might argue in any situation) he's going to be pulling out every word in his arsenal, and probably stringing them together for better effect. (in his view)
But, swearing for the sake of swearing is not a good idea.
Like I said, all about the character. Though, even a goody-two-shoes might let something slip in a straining circumstance.
Velkyn