“Women who make the room light up with their good looks may have a secret up their sleeve - it may be down to their menstrual cycle. Both men and women consider a woman’s face to be at its most attractive when she is at the peak of her fertility, according to new research.”

[Source]

This reminds me with the Egyptian proverb: “amar arba3tashar” (sometimes amar arba3tashar yakhwati :D). It’s something to said to compliment the beauty of a woman by comparing her face to the full moon (on the 14th night of a lunar month).