Dancing: Real dancing. Not grinding on some dudes/chick. Not like the kind of sex you have wiht clothes.
Nightlife! I'm sure we all have that one friend that has all the hook ups with the clubs! I know I have that silly monkey in my life.
Moives and TV: I can't watch them all! In fact I never watch these things, that's why I need all my friends to be knowledgeable for me.
Literature: part of the definition of literature is to increase human knowledge that can't otherwise be personally experienced. If all my friends were knowledgeable about books that I haven't read and told me about them, I would be a much smarter person. So would YOU!