Porn spammers at it again

Don't know what porn spammers hope to gain from this, but they're adding a parameter to an actual URL on my site and cloaking this information to Google.

You may see requests like this in your log file:

http://www.domain.com/mypage.html?ref=spammerdomain.com

Don't know what they're trying to game in Google, don't even give a shit, I'm just bouncing any request with "?ref=" in the URL to stop this nonsense cold.