The Laws of Attraction
In one recent study, Dr. Berman says researchers had women smell men's T-shirts. The women were most attracted to the shirts of men with a different major histocompatability complex (MHC) from them. MHC is a collection of genes that are related to immune systems. "We unconsciously want to mate with someone who has a different immune system than ours because that helps with the survival of our offspring," Dr. Berman says.