Parents need to know that this film contains graphic violence and a sex scene. There are several shootouts, some beatings, and a stabbing. Though the violence is graphic, the camera doesn't linger on the characters' suffering. The villains are racist South African diplomats, and the film seems to draw a connection between their country of origin and their racism. Though this made sense at the time, it might give young viewers the impression that Apartheid is still policy in South Africa. One character is essentially given a pass for money laundering.
Lethal Weapon 2 picks up with Riggs and Rog on a new case. The violence is pretty strong (i.e. a man is killed with a nail gun, two men are beaten to death by Riggs), so is the language (i.e. several uses of f--k and s--t as well as religious slurs). Sex is also pretty strong as well: there is a realistic passionate sex scene between Riggs and his new girlfriend, which contains some nudity (i.e. Rigg's rear end and his girlfriend's breasts; they are shown in more than one possition).