This is a false statement and you should retract it.
Gilbert says he found the additional photos by looking through vintage porn magazines.
He went to the house to research the property for comparison purposes.
NOTHING NEEDS TO BE RETRACTED:
http://www.wnd.com/2012/04/film-presidents-father-not-barack-obama/
Gilbert launched into what became two years of research during which he conducted interviews and discovered rare film footage and photos.
“I unearthed two film archives of Frank Marshall Davis, one from 1973, the other from 1987, as well as Davis’ photo collection,” he explained. “I then acquired 500 copies of the Honolulu Record, the communist-run newspaper where Davis wrote a weekly political column for eight years.”
Gilbert’s research turned shocking when he obtained seven indecent photos of Ann Dunham, Obama’s mother, at Frank Marshall Davis’ house, suggesting an intimate connection between Dunham and Davis.
To this, I responded with the comment that FMD wasn’t living in a house after he separated from Helen in 1970 (after a previous short separation and reconcilement) and as he died in 1987, the material Gilbert says he found must have been lying around in the little street-level apartment he was renting for many many many years.