I think the better question is - why are you looking for pictures of grandma? HEHEHEH I thought that porn couldn't advertise on adwords, too?
Man, NOTHING slips by the google staff that check MY ads... but others get away with putting in porn?
Wait. Porn is allowed on adwords. I just searched google for "fucking" and the page had typical adwords placements. I guess adsense is where adult content is not allowed? The adwords guy must be buying "oldies" and it came up. Only thing I can think of.
I think this is trojan horse installed in the user's PC. Google doesn't allows that kind of ads. Take a look to this article.
ah, my bad. I was drawn to the image at the bottom and went to that link. Ok, ther is some porn in there, sorry. edit - the ads that show the porn don't asy "ads by google" there are two seperate ads in there. another edit - why is the google ad in this thread clickable and the rest are not?
I think google makes enough profit of showing porn ads in their search engine that they do not need to use it on adsense.