Answer: Ben
Ben says this while he is talking to his boss, Mr.Warren, and the two Judys, Judy Spears and Judy Green. Ben is upset, because Mr.Warren has just given the DeLauer account to "the Judys", and it was because of Ben's tip that they even got the account in the first place. He is trying to get Mr. Warren to give the account to him, so he makes a bet with him, saying that he can get a girl to fall in love with him in 10 days. While Ben is trying to convince Mr. Warren that he knows how to market diamonds, he says, "the skills required to market diamonds are the same as those needed to make a woman fall in love". Then, one of the Judys says, "I'm not talking about lust. A woman in lust wants chocolate; a woman in love wants diamonds". That's when Ben says, "I'm not talking about lust either, ladies", and he starts his quote on love.