A study conducted in the USA by UCLA's Department of Psychiatry has revealed that the kind of face a woman finds attractive on a man can differ depending on where she is in her menstrual cycle. 

For example, if she is ovulating, she is attracted to men with rugged and masculine features. 

However, if she is menstruating, or menopausal, she tends to be more attracted to a man with scissors lodged in his temple and tape over his mouth while he is on fire.

- No further studies are expected.