Millions of Americans can’t smell, and there’s no treatment or cure for it. And if you’re on the pill, you may even have trouble sniffing out a good mate! But new research shows that falling in love can also alter a woman’s sense of smell, suggesting that smell serves as an evolutionary mechanism that reinforces monogamy.
Johan Lundstrom, primary investigator at the Cognitive Neuroimaging Laboratory at Monell Chemical Senses Center, found that when women are deeply in love, they lose some of their ability to differentiate the smells of their male friends.
To test this theory, Lundstrom took 20 female volunteers and measured how in love they were by having them fill out a questionnaire called the Passionate Love Scale. The women were asked to rate their feelings on a scale of 1 to 9 for questions such as:
I sense my body responding when [BOYFRIEND] touches me.
Sometimes I feel I can’t control my thoughts; they are obsessively on [BOYFRIEND].
I’d get jealous if I thought [BOYFRIEND] was falling in love with someone else.
Lundstrom then gave a T-shirt to each of the women’s boyfriends, one female friend, and one male friend, in order to collect body odor samples.

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