I read through the study, and their methodology seems decidedly
odd. They collected photos of women, then asked men and other
women to rate them as conveying "sadness", "friendliness",
"sexual interest", or "rejection". However, as far as I can
tell, the "ground truth" here is what the women whose photos
were taken were asked, in a laboratory (i.e. non-social)
environment, to convey. So, the study could simply be finding
that women are better at picking up what emotions other women
are articially aping than men are, not that they're actually
better at detecting real sexual interest in a social (dating,
courting) environment.