Farrah Abraham -- GRAPHIC SEX TAPE PHOTOS

This just got real ... TMZ has obtained graphic images from Farrah Abraham's upcoming sex tape ... and they're way gnarlier than we expected.

The 21-year-old "Teen Mom" star initially denied there even was a XXX tape -- but came clean about its existence last month, after her co-star James Deen blew the lid off her little plot.

As we reported, Vivid Entertainment paid Abraham in the high 6-figure range (nearly $1 million) for getting down and dirty on camera ... and boy does she get dirty ... the pics are intense.