The 'Who Is It' music video works as an extension of the song.There's nothing subtle about the title 'Streetwalker'. I'm not convinced Michael is going for subtlety here.
But does he? It's the video that brings in the theme of a high-class prostitute.
This just proves that lyrics are always open to interpretation. I don't understand the lyrics of Who Is It in this way at all. It's the video that presents a story about a prostitute. The lyrics just tell a story of a guy who's girlfriend has left him and he doesn't know who she's been having the affair with. It doesn't really matter, of course, the song *could* be about a prostitute and the deluded client she managed to scam but the lyrics don't make that clear and I don't think they are referring to it in a subtle way, either. It's another Leave Me Alone. The lyrics and the video don't match up but people always now assume that LMA is about media intrusion whereas the lyrics tell a different story.
There's a story here about betrayal, loss and broken dreams. I'm not so convinced WII is about deluded clients and prostitutes.
In other words, it is revealed in that why the woman cheats on him (because she is a high-class prostitute).
It appears that Michael Jackson had an obsession with themes of prostitution in his songs, especially when he was writing and recording songs for the 'BAD' album and for the 'Dangerous' album.
Notice that he also wrote and recorded the 'Do You Know Where Your Children Are' song, which refers to prostitution again (the mother is a prostitute, and her children run away from home and they become victims of prostitution).