Tears can turn men off.

Tears actually contain a pheromone can lower testosterone! Though they do not give off any noticeable odor, the act of sniffing tears can lower a man's testosterone and his sex drive. In a study, men were unable to detect the difference between real and fake tears (saline) by smelling them. However, taking swabs of their saliva revealed a decrease in testosterone levels after sniffing real tears. The men also tended to find women less attractive after sniffing real tears, and subsequent MRI scans indicated that sniffing tears in conjunction with watching a sad movie deactivates the neural networks of the brain associated with sexual activity.
(source)