This could be of concern - i.e. a bad site (i.e. one that has been penalized by say, Google) links to your site then places a link to the bad site in your log file. Are entries linking to say, the porn site, also appearing in your logs?
If so, are your log files located in a directory that can be spidered? If not, then you have no problem. If so, then use the robots.txt file to ask robots not to spider the log file or Webstats directory eg:
Disallow: /webstats
Then the log spammers have wasted their time, as they get no benefit whatsoever and you don't risk being associated with a "bad neighbourhood".
Ask your Web host whether the logfiles or stats files are located in a directory which can be spidered by googlebot.
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