The one farthest to his left is used for maid service, cooking and cleaning.
The one farthest to his right, is used to change channels on his tv, bring him his beer or wine, and also he lets her jump in his bed 1 hour before he gets in it (bed warmer so to speak) then he asks her to leave.

The one on his immediate right, is a stand in just in case his prime filet can't perform sexual favors for him. He does keep a paper or plastic bag (her choice) beside his bed.

And last but not least.......Well I believe you guessed what he uses her for. Oh, by the way, he says he would have voted for Bill Clinton again. Hell, he would have voted for Hilary!