If i remember correctly google just throws ad's related to the site and/or by area...
For example, if its a fashion website you'll most likely see lots of ad's for clothing, fashion etc... if its a website for TV's, then they'll most probably throw on a lot of Ad's to do with electronics...
Although, if for example MFK didn't actually like or agree with the ad's they can send in a request to have them removed from their site... since when i was still working with a fashion website we used to get a lot of ad's for fake shoe sites which we had google remove for us which never showed up again...