you know.. the way these ads are generated is usually based on what you search on google. they track what you search on the internet, do some data mining and present you the kind of ads that should interest you more. that's marketing. some time ago i searched for a few songs in japanese and now most of my ads are written in japanese aswell.
Well, since you're annoyed looking at girls pics I suppose someone else used your PC to look for boobs.The ads that show up for me are quite useful though, they're mostly ads for sales on phones, which I'm definitely interested in.
i got a gay party invitation ad