Yes. I'm assuming you mean in Google Adwords? When you are on the content network on Google adwords you can select which sites your ads are advertised on. If you leave it open for awhile it will show you all the sites the ads have been shown on. Helpful?
Yes, like seovancouver 142 said we can choose which site we want to show our ads. After selecting a certain campaign in adwords click on the "Network" tab then it will show a list of site where your ads are showing currently and you can exclude or include sites from that list.
You should be able to in the admin control panel, select what genre and type of websites for your ad!