According to a recent CipherTrust study, consumers respond to and spend money on 5% of spam messages that link to porn sites. That's in contrast to the 0.025% response rate generated by pharmaceutical spam and the 0.0075% rate for spam hawking Rolex watches and the like.

Why is this? Because evolution has made us more interested in sex than in medicine or fashionable timekeeping. It is all about what ensures greater survival.

But spam and Darwinian evolution are more interlinked than that. A few weeks ago I blogged about the Federal Trade Commission (FTC) and the state of California taking to court Qing Kuang "Rick" Yang and Peonie Pui Ting Chen for an enormous spamming business that generated mail under various names, including Optin Global, Vision Media, USA Lenders Network, USA Lenders and USA Debt Consolidation Service.

The case resulted in a deal in which the defendants didn't admit any wrongdoing but were fined $475,000 and agreed to refrain from illegal activity and to monitor their affiliates more closely.

This was a victory of sorts for the CAN-SPAM legislation, as well as for consumer activism, because what motivated the FTC to take the Optin Gang to court was consumers sent in more than 1.8 million examples of the defendants' spam. As this spam violated almost every provision of the CAN-SPAM Act, the FTC decided to do something about it.

I concluded my blog entry with a thought concerning the Darwinian forces involved. In this case a species, Optingangus Aggravatus (a member of the Spammerus family), found a niche and, like all animals that intend to survive and prosper, went about exploiting it.

The problem was that the Optin Gang became too big for its niche. It managed to set itself up to be detected by the FTC. The FTC, acting like predators, picked it off. Score one for the forces of nature.

Unfortunately, Darwinian forces keep pushing things along, so there are plenty of other members of the Spammerus family around to jump into the void left by the removal of the Optin Gang. Its disappearance simply leaves more of the niche for other spammers to capitalize on and to do so with less competition and more knowledge of where the dead species went wrong.

In other words, every time we get rid of a spammer we're opening the doors for new players to enter the market and evolve so that they adapt to their environment more successfully. We are breeding better spammers.