Emotion expression

Happy guys finish last: the impact of emotion expressions on sexual attraction.

Happiness was the most attractive female emotion expression, and one of the least attractive in males. In contrast, pride showed the reverse pattern; it was the most attractive male expression, and one of the least attractive in women. Shame displays were relatively attractive in both genders, and, among younger adult women viewers, male shame was more attractive than male happiness, and not substantially less than male pride.

http://www.ncbi.nlm.nih.gov/pubmed/21604870