I'm pretty young. In fact, this account is in my mom's name until next May for legal reasons.

Sure, why not? There's nearly nothing in Duke 3D that you aren't going to see on TV late at night, even down to the minor profanity and near nudity.

Sure, I first played Duke Nukem and started killing aliens when I was 12. So unless you're very easily affected you should give it a try.

I'm just afraid of the pixelated breasts.

If you're mature enough to kill and humiliate aliens, I think you are mature enough to see pixelated or even real nipples.

I'm guessing this is no worse then killing floor.

Nope... Seriously, tits are overrated.

Unless you install the High Resolution Pack, all the gore and nudity is low-res and laughably pixellated. Duke's swearing was contentious at the time, but it's nothing compared to recent games such as Grand Theft Auto: San Andreas (where they seem to treat expletives as nouns, verbs, and commas). Duke swears less than the average schoolchild.

Besides, the parental filter's still in the game.

I couldn't disagree more.

I'm an ass guy, I can't help it.

I am both. :D

Yes.
The games not that bad violence wise compared to some of the newer games that are being released.

I'd say get it, the dialogue isn't worse than an average PG-13 movie. Postal on the other hand...

well if we use the esrb as our guide
duke 3d, duke1, and dnmp are rated M
duke2 is rated teen
duke is basically late night tv now compared to modern games.
get blake stone if you want less gore in your fps.