Weird, I am getting ads that say "don't buy anything, you are already perfect". Hmm. Interesting!
Anyways, it is based on previous sites, news stories, etc.that we have been to. Google has control of us all!. Cdog, guessing you had recently read a JoePa story, hence the PSU ads.
I'm browsing from work, and not signed into any of my Google related accounts here, so that can't be it. Though I do appreciate the wide array of offerings ... cougar, Russian, Phillipino.... It's like a buffet.