Do you remember the song "Is She Really Going Out With Him" by Joe Jackson?

For 40 years I thought the opening lyric was "Pretty women out walking with guerrillas down my street", but today (Joe Jackson's 65th birthday) I discovered from the Internet that he actually sings "Pretty women out walking with [b]gorillas[/b] down my street". Why would a pretty woman want to walk down the street with a giant ape? Was Joe Jackson on some kind of hallucinatory drugs when he wrote the song?
[youtube=https://www.youtube.com/watch?v=r8PScDbLdeQ]