We process fragrance cues in the limbic system, the most primitive part of the brain and the place where we experience immediate emotions. One study even found that the scent of fresh cinnamon buns induced sexual arousal in a sample of male students! In another study, women sniffed T-shirts that men had worn for 2 days (wonder how much they paid them to do that?) and reported which they preferred. The women were most attracted to the odor of men who are genetically similar to themselves, though not too similar. The researchers claimed the findings were evidence that we are “wired” to select compatible mates, but not those so similar as to cause inbreeding problems.