Most women would agree that they put in a great deal of effort to look attractive for men. But even after buying that new dress, and getting your hair, nails, and makeup done, this isn’t what really does it for men. In fact, most women would be surprised to find out when men find them most attractive.

More Than Meets the Eye

A new study photographed 22 women’s faces, A new study photographed 22 women’s faces, and the results showed that their facial coloring had a more reddish-tinge when they began their ovulation. This was only recognizable in “zoomed” photographs; the naked eye wouldn’t necessarily notice.

The Animal Kingdom

Interestingly enough, studies of chimpanzees showed that females’ bottoms became redder when they were ovulating. This drew male primates to those females, and they ignored the other chimp women.

Flirty and Fertile

For humans, the signs of fertility may be less noticeable because of our evolved need for commitment. No “wham bam, thank you ma’am” for the modern gal. And although this adage may be true, other studies still show that ovulating women unconsciously dress more enticingly and flirt more aggressively. You go, tigress!