To deny or redirect visitors from a certain referer such as a page who links to your site in a context you seriously disapprove of, you can put the following .htaccess file in the root directory of your web page:

ErrorDocument 403 http://www.onlinesexaddict.org/
order mutual-failure
order deny,allow
SetEnvIf Referer "^http://.*example.com" local_ref=1
deny from env=local_ref

Dale Ghent adds:

If you're going the .htaccess file route (that is, putting the above config lines in a .htaccess file in your site's base directory) you need to make sure that the "AuthConfig" option to the "AllowOverride" directive is set.

For example, all my sites live under the "/local/vweb" directory on my server. So the document root for "yoursite.com" would be: /local/vweb/yoursite.com/htdocs"

So in my Apache httpd.conf file, I have the following:

    AllowOverride FileInfo AuthConfig Limit
    ...
    ... (other options)

The "AllowOverride" directive lets you specify what kind of Apache configration directives are allowed in a .htaccess file. The "AuthConfig" option is needed to specify authentication stuff in a .htaccess file.

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