A funny article from the Science magazine:
Gelstein et al., "Human Tears Contain a Chemosignal"
The authors found that women's tears contain some molecules, which, being sniffed by men, reduce their sexual desire and the level of testosterone:
"...We found that merely sniffing negative-emotion–related odorless tears obtained from women donors, induced reductions in sexual appeal attributed by men to pictures of women’s faces. Moreover, after sniffing such tears, men experienced reduced self-rated sexual arousal, reduced physiological measures of arousal, and reduced levels of testosterone."
via Igor Ivanov's blog