It queries the ads based on the thread topics in the forum we're currently looking at. Someone must've had "gay" in a title or a tag somewhere. In the News section, whenever there are lots of terrorism threads, I always get the "Muslim Dating Service" ads. :rofl:
I run a few ad block addons to firefox. Ad-Block Plus, Ghostery and Better Privacy. They all prevent any unwanted ads, ad tracker/scripts, and tracking cookies. So I see no ads, and websites that run google tracking, or any other tracking js scripts are blocked from loading. Only ones that load are ones the are not know to track peoples internet usage.