A webmaster asked in a Google Webmaster Help thread how would he be able to build an adult site that has a mix of content between adult and family friendly content on the same site.

The main thing to think about here is how to make it easy for Google and for users to determine structurally where the family friendly content is and where the adult content is.

Googler, JohnMu, suggested he go with unique domains or subdomains. If you can’t go that route, then try subfolders. Here is John’s advice:

As you can see, Google would prefer you use a completely separate domain and if not, then go with a subdomain. If that doesn’t work, then go with subdirectories and if you can’t do that, then try special URL parameters.

Also note John’s comment on the home page. If you do not want your home page to be associated as adult, then you need to think this out a bit.

Forum discussion at Google Webmaster Help.