Don't be fooled by the innocent-sounding title: There are a whole lot more fannies than fanny packs in this steamy morality tale from first-time director Marcel Langenegger. Ewan McGregor stars as a naive accountant who ventures into the dark under-world of New York City sex clubs under the guidance of a devilish co-worker (Hugh Jackman) and a mysterious lover (Michelle Williams). (April 25)