I was just considering this in two scenarios. I thought about it, than connected the other reasons, why I wondered. Testosterone transfer from men to women in sweat. And that episode of X Files, where the man secrets intense pheromones on his palms.
Two common possibilities, also depending on what kind you are wearing. So feel free to speculate as if you were wearing which ever kind you want.
A. You are out, and around, wearing your pheromones. Meeting people chatting them up. What would happen if some of the pheromones happened to rub off onto the skin of someone you were talking too? Whether Possible interest… Or just anyone.
B. You are with people you’ve known for a long time. They know your “signature scent” because you have been using the same basic cologne/pheromone combination around them for a while. They know it was from you when they smell it. Even possibly subconsciously, how would effect people in that case?