An important study
 

A study conducted by the UCLA's Department of Psychiatry has revealed that the kind of male face a woman finds attractive can differ depending on where she is in her menstrual cycle. For instance, if she is ovulating she is attracted to men with rugged and masculine features.

However, if she is menstruating, or menopausal, she is more prone to be attracted to a man with scissors lodged in his temple and a bat jammed up his ass while he is on fire.

Further studies are expected.