The “halitosis bomb” and “gay bomb” are informal names for two theoretical non-lethal chemical weapons, which a United States Air Force research laboratory speculated about producing. It involved discharging female sex pheromones over enemy forces in order to make them sexually attracted to each other.
In the 1970s, “copulins” were patented as products which release human pheromones, based on research on rhesus monkeys. Androstenone, axillary sweat, and “vomodors” have been claimed to act as human pheromones.
Using brain imaging technique, Swedish researchers have shown that homosexual and heterosexual males’ brains respond differently to two odors that may be involved in sexual arousal, and that the homosexual men respond in the same way as heterosexual women.