What's up with fake referral logs?

I checked my referral logs today and this came up. Warning, it's a blog full of hot naked ladies, so don't go there unless you want to see that. Of course there's no link to Seattle Scribe there. WTF?

I'm not really complaining in this particular case, but I get alot of these occurrences. Most of them are to blogs written in Spanish or something. Is this a form of spamming? Why would a blog that isn't trying to sell anything do that?

UPDATE: Upon further, um, research, the linked site leads eventually to pay sites. But that doesn't explain why ones like this one keep showing up in my referral logs.