I wouldn't say it's raunchy at all. Or toilet humor for that matter (that comment on the article linked here, ugh). It's vulgar but not over-the-top every other word. It is all used as a humor device. The person I was with who doesn't especially enjoy vulgarity was rolling with laughter. Definitely not too much for a sixteen year old UNLESS they are offended by profanity. It's hilarious.
Thanks to all for your input. Nothing wrong with an occasional well-placed f-bomb (who isn't culpable of that?!). I'm sure my 16 year old will love it.