My Mum has just shown me this joke book she has bought to wrap up as a bit of a laugh for my DS, who is always telling her jokes.
I've just been flicking through it and there is quite a lot of adult humour in there (reference to sex etc). Not a problem re my young adult son but it's the sort of thing you might have bought for a younger child who you wouldn't want to read the adult humour. Lots of the jokes are suitable for all so you might not have noticed having a quick flick through in the shop.