ƒιzz isn't completely correct, I do have some control over what adverts are displayed. And in fact I've blocked lots of stuff in AdSense.
Firstly there are various "sensitive categories" that can be blocked, such as "references to sex", weight loss or cosmetic procedures. I already have the first one blocked so the ad you posted should not have been shown. I will check into that one. I can maybe block some of these other categories too.
I can also block any URL I want to. I already have 60 different URLs blocked - mostly the ads that say things like "Download the app" which are basically misleading because it sounds like it's an app for this site.
I can also block specific ads if necessary, or the whole company that's running the ad(s). Again, I've blocked dozens of these but the problem here is that the same company just makes a new AdWords account and puts ads up again. It's pretty annoying!
I think it's probably a good idea to make a report thread, and I'll block what I can. As ƒιzz said you can also click the X on an ad. You should then see a button "Report this ad" so if it's a scummy ad that shouldn't be on here, click that and it should block it.