Sci-fi nerds will be able to release a fangasm later this year when Straightheads comes out at the end of the year, as it features Gillian Anderson nude. A source says "Gillian does get naked in a couple parts of the film, there are two sex scenes between her and Danny [Dyer] . . . the first sex scene I dont think you see anything of either of them (this is the now almost famous up against a tree scene. But near the beginning theres a shower scene, top half on show, and in the next sex scene you see her top half and everywhere else except for her 'modesty'!!"
I'm guessing her 'modesty' means no groin shot. Oh well, at least the tush is out there! I suck.
EDIT: she has kinda been nude before, in a movie called The Turning. See that here (NSFW).