There should be a small "i" icon, next to the arrow when you hover your mouse. Use this to set your personal ad settings.
I am a Blender user and often find myself correcting the advert on the subject.
As a artist I often need to research objects for modeling, to prevent these searches from confusing the adverts I use incognito mode; for searches unrelated to my own interests.
1 hour ago, kseh said:
I have the Google Ad profile turned off and in the past I've had ads for blenders (the appliance) appear in threads about using Blender (the software). There's a thread right now in the lounge that at the moment is NSFW on page 2.
The adds by amazon that appear in-between comments in the forums reads the topic to advertise content. So if the topic is a bit NSFW and you don't prevent google from showing those adverts, you can get them here on Gamedev.
If however you get a lot of click here adverts, you won addverts, words appearing highlighted links, a lot of NSFW adverts. Then you need to get a better anti virus, because that is malware.