at the moment the option to avoid these ads appearing on your website(s) is to delete them on "view&bid" page. We are now preparing "block&report the ad" option so any harmful advertising can be permanently block from appearing and will be reported to admin to deal with it and its provider.
Other way would be manual validation of all new ads but it would mean delay for advertisers to have their ads up and running - in case faulty ads will appear continuously we will probably go this way.
Sorry for inconvenience - we are taking steps to avoid this.
Having to wait until I get the porn or phishing ad on my adspace and hope I do notice it is not a solution!
I've just had to delete a phishing site:
http://2bitco.in/login.html - I can't have any of my traffic going to something like this. You really need to be able to ban domains and whole accounts - and also be serious with it and confiscate bitcoin balances.