ATTENTION MASSIVE SPOILERS AHEAD!!!!
Here are some examples:
In various bathroom locations throughout the game, the player can have Duke “piss” in urinals and on occasion, in these same venues can also pick up faecal matter from a toilet bowl and throw it about.
The Board also notes the player ability, in a final climactic scene when Duke kills the alien general, to implicitly urinate into the defeated creature’s eye socket. The Board notes that within that playable context, no other ability is affected which enables the player to direct urine flow or throw faecal matter at or onto other characters and no nudity is depicted during these activies.
No dismemberment or decapitation is viewed.Commentary: I guess the classification board didn't played the game properly! LOL
In one of the game levels, Duke enters an alien lair to “rescue” kidnapped Earth women who have been implicitly impregnated by the alien enemy.
These women are rendered with a mannequin-like appearance, and appear torso nude and partially cocooned either suspected from a cave-like roof or against walls.
In order to “spare” the women’s suffering Duke has the ability to shoot the women resulting in small blood bursts. Those he does not shoot are seen implicitly exploding as the alien “baby” matures.
In the level Titty City, Duke enters a strip club where he meets a stripper who invites him to locate (among other items) a vibrator and a condom.Source
In the men’s toilet, Duke can enter a toilet cubicle with what appears to be a “glory hole” in the cubicle wall. A cartoon image of a woman’s face is on the wall with a hole evident in the drawing’s mouth and the word “Yum” beside it.
Upon the successful completion of this level, Duke is given a “special” lap-dance by the stripper. The breast nude female is depicted in a first person perspective implicitly gyrating on Duke’s lap.
The Board notes a facility also exists for the player to “jiggle” the stripper’s breasts during this scene.
Original source