It is amazing how much objectionable content they put in that game while still maintaining a satirical black comedy tone instead of a "trying too hard" feel. The tagline was "it's only as violent as you are!" as it is possible to complete all your tasks without violence.
At one point, it has you protecting the developers of the game from anti-violent video game protestors who want to solve their problems with violence.
You can use cats as suppressors for your weapon.
You can urinate at will, and can discover you're infected with gonorrhea, for which you can get medicine.
Really, a great game for those with an open sense of humor. Postal 2 is a great example of why games shouldn't be censored.
Remember that if you urinate on somebody with the gonorrhea urine it will instantly kick them into the vomiting state, which can be useful if you don't treat it--I seem to recall that as an optional sidequest.
Postal 2 was one of the funniest games I ever played.
Also, the movie was practically the only movie adaptation of a video game that did not totally suck. (It got there using the same indiscriminate crude humor of the game, but it did not pretend to be anything else.)
It's goofy, and has it's fair share of [sometimes funny] bugs, plus it has first person view.
It's currently on sale for $0.99 on Steam[1]
[1] http://store.steampowered.com/app/223470/