[AC Question]

When I click on a link to read an article, explicit ads are showing up. I want to get rid of those and block whatever is causing it.
History is void of any visits from questionable sites.

[db2001]

There are two things you can do to fix this issue.

First:

Edit your interests

1. Sign in to Ads Settings at www.google.com/settings/ads/authenticated
2. Below “Your interests,” click +ADD NEW INTEREST.
3. To add interests: Type an interest in the search box and select the one you want. Then, click the Add button. See a complete list of ad interest categories.
4. To remove interests: Locate the interests you want to remove. Then, uncheck the box.

Or you can:

Change you gender and/or age

1. Sign in to Ads Settings at www.google.com/settings/ads/authenticated.
2. Click the pencil icon to the right of Your Google profile.

If this doesn't help you can just simple press the "X" or "I" in the top corner of an ad and select "Stop seeing this ad".

Hope it helps!

Source:
https://support.google.com/ads/answer/2662850?hl=en