Our mood states and behaviors naturally vary over the course of the year. For example, some people experience Seasonal Affective Disorder, a form of depression that usually kicks in during the winter. Extreme psychological changes like this are relatively rare; however, smaller seasonal fluctuations are actually quite common, even among healthy people , and these changes can have noticeable implications for our sexual and romantic lives. Indeed, a recent study revealed that, at least among heterosexual men, their patterns of sexual attraction change with the seasons, and not in the way that you might expect .
Mind=blown on this one. Apparently men find their partners more attractive during the winter months than the summer months.