Hi,
Bahrain has no scarcity of WG's, the best place is to ask the hotel reception.
I remember going there on a business trip in 2016, it was late when I reached and had an early morning meeting.
I was disturbed atleast 3 times in the middle of the night, once by the receptionist and twice by WG's if I am looking for company, all I could say was not tonight but definitely tomorrow.
Most of them are Far Eastern(Chinese, phillipinos) , if you are looking for white, black or anyone else then you will need put in some effort.