Pushkin had the ability to "compartmentalize," writing at the same time beautiful poetry about women of his acquaintance, and rather crude remarks about them in his correspondence, so it wouldn't be surprising if he actually wrote the disputed poems.
The DVD "Onegin" starring Ralph Fiennes and Liv Tyler (Lord of the Rings) is available for rental in major video outlets.
I have actually read very little Puskin and was totally unaware that the movie about Mozart was based on his writing, but now I'm going to have to seek out some of his supposedly erotic poetry. Censorship of renowned literature is very scary. The puritanic bent of the communists comes from their lack of religion. They think that they can legislate morality to replace religious moral guidance.