If you want 3-D pr0n there are regularly 50s era pingup stereo slides for sale on ebay. They're usually on the pricy side, at least for my budget--they rarely go for less than $10 per slide. There's also
this and
this. One photographer who's done a lot of nudes said on a stereo photography mailing list said that he's been able to get some publishers interested in his photos, but they just want to publish them as 2-D images, not stereo.