Why do Tita and Pedro experience such a sensuous moment when he sees her grinding almonds and sesame for the mole?

THere is a connection between love, sex and food. All fill the human soul. Pedro overhears Tita singing in the kitchen and smells the browning sesame seeds. Attracted by the smells, Pedro walks into the kitchen. The image of Tita on the floor grinding almonds and sesame seeds instantly transfixes him. The two exchange a longing and erotic gaze, until Chencha walks into the kitchen and interrupts their moment. After the exchange Tita no longer feels chaste even though she and Pedro never touched.