When I started this little ego site it didn't take long for referral spammers arrived. First it started with lots of domains by spammers em3, pushing ordinary porn and spyware. Then there was spanking porn referrals. It changed to female libido pills. Now it's "herbal" sleeping pills. I do keep a record of the spammers so they never get linked to, boosting their google ranking.
Interesting evolution here though, your day starts by looking at naked women, then finding one to spank, then drugging her so she's actually turned on by your porn browsing and spanking her and then to help yourself sleep it's time to take a sleeping pill.