So, the correlation between asexuality and olfactory senses seems to highlight that while the two don't necessary share causality for each other, but can shed light on the nature of the asexuality and the olfactory sense's place in someone's sensory hierarchy. Some might be pheromone-based, others not. Some might pack the sensations together into a different causal relationship than some consider "normal" -- such as, hunger reaction paired with sexual stimuli, etc.