[stevekemp]

99% of the time when you got "random questions" like this in a game it was an anti-piracy trait. The idea was that people might be able to copy your disc, but they would be unable to play the game unless they could answer your questions - which would require the manual to be used.

(Bearing in mind that photocopiers were uncommon at the time.)

In the case of Leisure Suit Larry the opening questions were actually designed as an age-test. The intention was that "children" wouldn't know the answers and would be unable to play the "risqué" game.