Science -- Nojima et al. 307 (5712): 1104:
The sex pheromone of the German cockroach, Blattella germanica, has been characterized as gentisyl quinone isovalerate. This cockroach is a major cause of allergic disease and serves as a mechanical vector of pathogens, making it one of the most important residential and food-associated pests worldwide.
Sex pheromones evolve just like cricket calls
or rodent penises
. Understanding the product of the mechanism that allows roaches to meet each other is key to preventing all manner of diseases.