Why did Shakespeare put such crude characters and language into the play Romeo and Juliet?

Shakespeare's audience included all kinds of people, some of whom came to the theatre looking for some dirty jokes, some hilarity by the clown, and a sWordfight or a bloody murder or two. Shakespeare had to write for that part of the audience too.

Romeo and Juliet is not the only play with dirty language in it; most of them have it. Julius Caesar doesn't, but makes up for it with a particularly juicy murder.