I include a short 18 USC 2257 statement at the bottom of my TGP galleries to cover my ass. I give the URL of where the 2257 info is, but I don't make it clickable to minimize the # of links on the page.

Some TGP's use sexually-explicit webmaster-submitted thumbnail pics as links to the galleries. I'd imagine those TGP's (if USA) would want to require 2257 statements on the submitted galleries, if they want to be legally cautious.