I don’t really use sub-domains but I am curious as to why some people are against them.
The SE’s do not seem to mind them at all and even seem credit them as a unique domain.
Also in that example I think they would look more like this
www.bert.com/blonde/nude/index.htm
www.bert.com/blondes/naked/index.htm
vs.
blonde.bert.com/nude/index.htm
blondes.bert.com/naked/index.htm
without the www
Once you create them either URL will access the same directory.
Thus you can please all parties but this also dilutes the pages PR.
I just remembered a domain that submits to my LL
the domain is "hiddenserver.com"
they have created the subdomain "my"
so it appears as "my.hiddenserver.com" which I thought was a clever use of a subdomain.