Welcome to the forum!
You might be better off playing around with the openness and bonding pheromones (like oxytocin). Because couplins are derived from vaginal secretions, they can be–erm–pungent (even in tiny amounts) and, in many cultures, can send a signal that could be counter-productive for many women. (I’ve heard it called the “slut” or “whore pheromone.” 
Not politically correct, I know, but descriptive nonetheless.)