Tuesday, August 19, 2008 - Posts
-
sponsorship
Meghan, I checked out that T-shirt sniffing study you flagged, and, well, it hardly implies a crisis for pill-users – or a pink slip for novelists.
To recap: The researchers asked women to rate the smells of T-shirts worn by different men. For each woman, they chose three men who were more genetically similar (in terms of a specific set of genes) and three men who were less similar. The genes in question were part of the major histocompatibility complex, or MHC, which plays a crucial role in immune function and is also linked to body odor (possibly because of interactions between the immune system and skin bacteria). The researchers found that when women began taking birth control pills, their smell preferences shifted somewhat toward men with more similar MHC profiles, though the difference was not huge.
Why might this matter? In the past, some research found that women tended to prefer the smell of men whose MHC makeup differed more extensively from their own. That result remains controversial, but from an evolutionary perspective, it makes for a good story. When women mate with less similar men, their kids may have more robust immune systems that can better fend off a wide range of diseases. In theory at least, that advantage may have helped to shape women’s tastes over time. As for the pill, if it were to skew preferences toward MHC similarity, women might smile on less genetically favorable partners, leading to problems in the long run. When women stop taking the pill, for instance, their tastes might shift again, resulting in “the breakdown of relationships," as one researcher speculated. Hence the maelstrom about women choosing the “wrong” men.
Strikingly, however, the current study fails to confirm the premise of that whole story. When women smelled men's T-shirts at the outset, before any of them took the pill, they showed no preference for men with more MHC difference. That is, they did not exhibit the supposed tendency that the pill supposedly disrupts. What’s more, when women taking the pill smelled the T-shirts again, they showed no preference for men with more MHC similarity. Yes, the pill-takers tended to rate the smell of MHC-similar men more favorably than they had before. But to repeat: They still didn’t prefer the similar guys overall. Despite the hype, then, this study’s findings are limited – and pretty messy.
Of course smell can play a role in romance. And the scent of MHC difference could turn out to be one factor – of many – that influences women’s choices. But really, when it comes to searing insight into longing and romantic crisis, T-shirt sniffing has nothing on Flaubert.
Join the Fray: our reader discussion forum
What did you think of this article?