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I'd think you can use keywords in those subdomains and the SE's would treat them different (better) than when you use directories.
But that's just a wild guess ofcourse
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Keywords in domain names is a factor but to me keyword-loaded subdomains is a negative quality signal, especially if each subdomain is only a few pages deep. Sites like google.com, amazon.com, wikipedia.com may use subdomains but the number of subdomains is relatively small, subdomain names aren't keyword-loaded (finance.google, checkout.google, labs.google, etc.), and each subdomain usually houses hundreds if not thousands of urls.
One possible advantage is your urls will be shorter:
lesbianporn. xxx.com VS
www. xxx.com/lesbianporn/