"Use the word 'whore' 'prostitute' or any variation of the two....... will result in the termination of the booking"
They're amongst many words and terms that at one time were commonplace and are now, quite rightly, seen as offensive and degrading, such as :
Nigger, queer, tart, slapper, psycho, coon, dyke, paddy, jock, paki, chinky, looney ,,,,,,,,,,, etc.
I'm old enough to remember when words such as those were widely used, including mainstream television comedies on the BBC of all places.