Kissing isn't sex. Sorry, extrapolating from this that sex sells (which is obviously true anyway), is bizarre and shows a one-track mind.
Pretty girls do sell. Even if they are just kissing, or even if they are wearing a beautiful dress.
If this commercial showed the girl half naked in a bed with the guy, that would be more sexual. Kissing? That's a reach.
I personally found the commercial disgusting. I think that's where it was going. Shock/disgust to get a reaction. If this commercial was sexy to you, maybe you need a pill from a doctor.