It's a horrible, horrible campaign. It emphasises the sexual nature of opening your legs, whereas what you want as a woman thinking about smears is to de-sexualise it - to think of it as a simple, necessary medical procedure.
It reminds me of that other awful campaign: "Don't be a diva, it's only a beaver."
Furthermore, they haven't put any effort into finding out why women don't have smears, which I suspect in many cases is because women find it painful or traumatising.
I can only imagine this ad will put women off having a smear, rather than making them think it's a good idea.