[masomenos]

Going by the analysis in the post, and in the parent comment, the 20mm would probably be positively correlated with attractiveness because it's easier to get a shallower depth of field with it.

However, you're certainly correct that conventional photographic wisdom is that people look better on longer lenses, for just the reason you cite -- wider angles can distort faces unpleasantly. It would have been interesting to see an analysis of lens length & perceived attractiveness from this dataset.

[starkfist]

You have to be too close to the face in order to throw out the background with a 20mm 1.9. It's going to make the nose look weird and accentuate a double chin, if you have one. (I have the same camera and lens)

[j00lz]

I get great results from using that lens for portraits. The 20mm lens is really a 40mm due to the x2 cropped sensor in m4/3 cameras.

[jonah]

40mm equiv. is too wide for portraiture. typically you use around an 85mm lens. this would work out to 40-50mm in micro four thirds.