In the Courtship and Mating Assay, Two fruit flies meet in an acrylic mating chamber and check each other out. It's the insect version of speed dating for science. The male taps the female with his leg, which is studded with pheromone-sensing receptors. He then might doggedly follow her around and serenade her with a song by sticking out a wing and vibrating it. But before the male engages in this courtship ritual, he needs to make an important decision: Should he put the moves on this female or not?