Odorant-binding protein required for olfactory behavior and activity of pheromone-sensitive neurons in response to the male-specific pheromone cis-vaccenyl acetate (cVA). Modulates social responsivity differently in males and females, regulating male aggression and female receptivity respectively. Secreted in the lumen of olfactory hairs. Expressed in the antenna, mostly on the anterior surface of the third antennal segment (PubMed:7545907, PubMed:29630598). Expressed in auxilary cells and the third antennal segment and exported to the sensillar lymph (at protein level) (PubMed:29630598). Expression is inversely regulated in male and female in response to the male-specific pheromone cis-vaccenyl acetate (cVA) and is dependent on the active neurotransmission of cVA-sensitive neurons to second order olfactory neurons. RNAi-mediated knockdown in males results in reduction of aggressive display. RNAi-mediated knockdown in females results in a significant reduction in sexual receptivity after exposure to the male-specific pheromone cis-vaccenyl acetate (cVA). Belongs to the PBP/GOBP family.