Banning a domain/server from accessing my site?

Hi:
Starting two days I noticed in my log files a porn site high up in my referrals section (I use http-analyze). I don't see the site linking to mine anywhere, so it must be hotlinking some file(s) and racking up my bandwidth/server load big time. My question is, what's the easiest way to completely ban this server/domain (lets say xxx.com) from accessing my server?

Much thanks!

 

 

 

 

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