When bad guys are shot with a rocket launcher we see them in explode in a shower of blood and gore.
Some mild sex references: the game features some sexy aliens that wear bikini tops and make suggestive comments.
The player will sometimes come across the Biker enemy having rough sex with his cheerleader girlfriend(?). This distraction makes him an easy target.
After killing a Biker, Leonard will sometimes retort "Turn around boy -- lemme see if I recognize you from prison!", alluding to, well...you know.
The theme song "Redneck Rampage" has lyrics that allude to crude sexual humor and jokes ("My family's tree's a stump!"; "Your Honor, I didn't know she was underaged!')
One of the weapons Leonard uses is an alien machine gun fashioned after a pair of human female breasts, with the tits acting as the gun tips.