I don't know if this is asked before but here it is.
I don't have a website so I don't know how all the ad-stuff goes and how much you can choose the ads your site displays. But what if there happens to be an ad on your site that is actually leading to a site that is not something that contributes and you wish your visitors would visit.
What is your look on inappropriate/unethical/foul/just generally bad ads your good and contributing site might display? Or just generally, what do you think about sports stars being sponsored by alcohol/tobacco companies? Sport & beer/fag doesn't make exactly the greatest combo... (I asked about website ads since a lot of you here have something to do with them so it's more related)
I hope I worded my question well enough, let me know if there's trouble understanding, I'll help you out.