What is the secret of women who are sexy without even trying?

There is this actress named Lara Pulver which I find very sexy. The thing is that she's not neccessarily the most attractive physically speaking... I mean, she is attractive but there are some women who are more beautiful than her and dress revealing but aren't that sexy. She dresses quite conservative and doesn't show much skin... but still. It made me wonder what do these women do? I'm sure you know some other examples, please give me some names if they come to your mind. What do they do too ooze this charm and sex-appeal?
What is the secret of women who are sexy without even trying?
What is the secret of women who are sexy without even trying?
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