Various Aromas Found to Enhance Male Sexual Response

"Dr. Hirsch’s team theorized that pleasant odors, since they tend to positively increase other behaviors, would likely increase penile blood flow. Their data supported this hypothesis"

"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."

And I'm guessing that those employed in law enforcement responded most strongly to doughnuts.