What guys really notice about your looks: certain aspects of your appearance might drive you crazy, but trust us, men aren't paying attention. Read on for the surprising news.

When you have an annoying breakout on your chin or you've forgotten to touch up your roots, you might think it's all your guy is looking at. Well, relax. "Most men aren't picking up on the things we assume they're staring at," says renowned biological anthropologist Helen Fisher, PhD, author of Why We Love. The reason, she says, has a lot to do with evolution. "In general, men are wired to notice obvious signs that convey interest in mating--a warm smile, for example--and ignore other subtleties, like if your lipstick is faded," she explains. We asked Fisher to illuminate us more on her fascinating research.

He won't notice ...

If your hairstyle is a little messy.

He will notice ...

If your hair condition isn't great.

Fisher explains "Men couldn't care less if your strands are perfectly styled and neat. In fact, he might like you--more with some wildness or bedhead, since it shows you're carefree and relaxed. But he will notice if your hair looks or feels very dry, brittle, or damaged, which are signs of poor health. On a subconscious level, men seek out partners who possess healthy physical attributes."

So spend more time lounging with him on Saturday morning and less time flat-ironing in the bathroom. If you have some damaged spots, mist with a healing leave-in spray (like John Frieda Daily Nourishment Leave-In Conditioning Spray, $5.99).