DecorPlanet posted a complaint in the Google Webmaster Help forums where Google Video search is showing pornographic and adult videos even when the filter is set to only show search results from his site.
To reproduce the bug or the spam target:
1) Go to Google Videos and search for "shower panels videos"
2) Under Any Source filter, click "decorplanet.com"
3) Go to page 4+ (first 3 and a half pages have legit decorplanet's videos)
Now, I don't see the pornography until closer to page ten or so. But I still see it, even when I am filtering the results to just show me videos from the decorplanet.com source.
I am not sure if this is a bug with Google or if pornographers are spamming an loophole in Google - or maybe both?
Gary Illyes from Google said in the forum thread:
Thanks for reaching out. I let the engineers know about it and they'll take a look.
The issue is still there and there is no word on a fix from Google yet.
Forum discussion at Google Webmaster Help.