Well, IMO rather them than you. remember, you have to be there everyday as well, and if you have to worry about fatty rubbin her lard on your face how the hell can you accomplish anything at work?
my advice: DO NOT under ANY circumstances confront the lady(s) and say you know, i dont like you rubbing your ass in my face... etc. because they will do it more. Definately dont threathen them either, that just makes things uncomfortable.
What I think you should do is be respectful, but a ball buster to the fat women. You will fulfill their attention requirements and they will leave you alone, your simply not giving them enough attention and by rubbing their ass' in your face their getting exactly what they want. Give them what they want, appease them with attention, BUT on YOUR terms, not theirs. BUST THEIR CHOPS. If all of the fat lady's fall in love with you and have nothing but good words to say about you, the hot girls will come for you, immediately.