Spanish fly is an aphrodisiac, which means that it heightens sexual desire. Marquis de Sade used to give prostitutes pastilles with high concentrations of this substance, often with fatal consequences for his victims. In isolated cases this practice still occurs. Blum adds that toxicity is, of course, dosage dependent. Blum argues that Africanized bees can be guided to a source by using attractant pheromones.
Synthetical equivalents are commercially available.