The sense of smell works in an anatomically different way than other senses — the olfactory signal goes directly to the limbic system, the brain's center for emotions and memory, bypassing the "middleman" in the thalamus.
Why is smell such a powerful emotional trigger? It is because of this direct neurological connection that smells can instantly evoke strong emotional memories—which explains why a familiar scent (of perfume, a candle) can instantly “transport” a person into a certain emotional state.
The controversial issue of pheromones The existence and effects of human pheromones (as opposed to those in animals) remain scientifically controversial—clear, consistent evidence for human pheromone interactions is limited. The claims of commercial "pheromone" perfumes have not been sufficiently clinically substantiated.
Where is the solid scientific basis? More reliable are studies that simply show the general calming, stress-reducing effect of pleasant scents (lavender, vanilla, sandalwood) — which indirectly, but actually, promotes relaxation and, consequently, a mood for intimacy.
Practical Uses A candle, an essential oil diffuser, or simply clean, freshly laundered linens—all of these create a basic, pleasant-smelling environment that doesn't require "magical" aphrodisiac substances to be effective.
The Importance of Personal Smell Your own (and your partner's) natural body odor also plays an important role in attraction—too much perfume can actually mask this natural, intimate signal, which studies have linked to real attraction.