I read this study
Each of the 30 odors produced an increase in penile blood flow. However, not all increased arousal to the same degree. The combined odor of lavender and pumpkin pie had the greatest effect, increasing median penile blood flow by 40%. Next in effectiveness was the combination of black licorice and doughnut, which increased arousal by 31.5%. And so on, all the way down to cranberry, which only increased penile blood flow by 2%. Depending on the man’s age, they may have reacted differently than their counterparts to certain smells. For instance, older men tended to respond strongly to vanilla.
*watch out in the kitchen today ladies. No wonder they used to keep pies in safes!*