Pardon my ignorance. Does YWN use Google ads? I was under the impression that YWN does not carry such advertising at all.
There are other sites that do, and try their best to make sure that those with objectionable material do not appear. Yet, this effort is never perfect, and there can be occasional ads that are inappropriate. When that happens to a frum site, just inform the webmaster, and you will find they are glad to help and remove it.