dean, there is no law in the u.s. that says you should use a warning page. some traffic is lost by a warning page - try posting a gallery and linking it to the tour and another linked to the warning page and you will see that some people turn away at the warning page who come from your gallery.

there are 4 reasons to have a warning page:

1. because you legitimately want to let minors and people who arrive at your site by accident know what the content is so they can go elsewhere.

***** the catch here is that unless all your other pages are unavailable through .htaccess, minors and otherscan still get to every other page in your site by accident from search engines. cduniverse does this one right a lot of the time.

2. because if you ever have legal trouble on your site, showing that you did your best to keep out minors or people who find porn objectionable could help you look well-meaning.

***** once judges and district attorneys get more "internet smarts", this won't work unless you use .htaccess to keep people coming from search egnines away from your tour. cduniverse does this one right a lot of the time.

3. because a warning page is another page to collect search engine hits.

***** depends on how you would handle text on your warning page and also depends on whether it would send enough traffic to make up for people who you'd lose due to the warning page.

4. a great place to put recips to link lists and review sites.

***** if you send your affiliate traffic to the actual tour page rather than the warning page, this is a good way to keep recips from damaging the appearance of your tour.