Im not using this method yet as im not building freesites at the rate most people do but this sounds like a reasonable way of doing it maybe
adding this to your robots.txt
Code:
Sitemap: http://www.urdomain.tld/sitemap.xml
User-agent: *
Disallow: /freesites/porn/freesite-mirror.html
Disallow: /freesites/porn/freesite-mirror2.html
then adding the url's you would like to be indexed to the sitemap file