"I suspect the ads are done via Google. As I understand it, Google looks at your browser history and places ads based on that."
That's how I understood it as well, Nick, but here's the rub: I do not do much web browsing in general, that only from a PC, and I'm not at all interested in T&A shows, porn, or any other spectator sport. The objectionable stuff that was showing up on BPL pages I viewed had nothing to do with my browsing habits, with one exception early on, when I linked to an article in an Israeli newspaper, Haaretz, to read a political article. There was that famous "Want to learn French?" ad that many people here have mentioned. Sure enough, it followed me back to BPL. Other than that, I have no idea where the rest of the crap was coming from. In any case, it has disappeared over the last few days. However it was resolved, without any change whatsoever in my browsing habits, so I am now a happy camper. I am now in the process of trying to decide whether to genuflect in the direction of Bozeman or just chalk it up to some natural phenomenon like sunspots or climate change. ;0)