It's the word FREE... and I really hate it when it's used on the pay sites or those that sell AVS membership... I mean, one thing is to say "Free with your membership to...." (but it's still not free), while another thing is to say "Free Pictures" and when you click on them you have to login with ID or username or whatever...

I'm only wondering:

a.) Are porn users so bloody horny at that point that they just don't care how they screw them?

b.) Are webmasters really that naive?

There must be a reasonable use for word Free, but not in the way most of webmasters do