The drama, which was previously titled The Surrogate, centres on a writer (Hawkes) who has been in an iron lung since contracting polio as a child.
He hires a sexual surrogate (Hunt) to help him lose his virginity, with the help of his therapist and priest.
William H Macy also stars in the film, which is directed by Ben Lewin and debuted at this year's Sundance Film Festival.
> John Hawkes, Sean Durkin 'Martha Marcy May Marlene' interview
The Sessions will be released on October 26 in the US, with a 2013 release yet to be confirmed in the UK. Watch the trailer below: