Behavioral targeted advertising.

Mainstream advertising networks have been doing this for a few years (DoubleClick (a division of Google), AdKeeper, Google Adsense, quantserve (http://www.quantcast.com/how-we-do-i...choice/opt-out), and lots of others ...) .

I was not aware that adult advertising networks were using similar tactics.

This targeting is becoming more commonplace but it is also becoming an obvious online privacy issue and backfiring badly; with increased governmental scrutiny and legislation to protect consumer privacy.