In a Google Webmaster Help thread, a webmaster asked how to make a adult site with family friendly content under the same domain.
Googler, JohnMu, suggested to PREFERABLY go with following points:-
- Choose completely unique domain, if not
- Go with subdomain, if not possible
- Use subdirectories, if can’t possible
- Try special URL parameters.
Here is John’s advice:
Generally speaking, if you can, I’d recommend separating your adult content from the more general content, so that it’s easier for search engines to separate that on their side as well. Using a separate domain or subdomain is a pretty clear sign, subdirectories alone may be little bit harder to recognize (but if that works for you, why not), and using URL parameters is probably even harder. One thing I would watch out for, especially with a site focused on user-generated-content, is that you keep your homepage clearly adult or non-adult focused. For example, if you were to list posts & photos from all parts of your site on your homepage, it might be that we end up classifying your homepage as being adult-oriented, which might not be what you’d want.
Here John also commented on the home page and said if user don’t want to home page to be associated as adult, then need to think this out a bit.