Will it be possible for you to put Adults Only as a category by itself and not under Whatever's left? This way, adults looking for adult only items will find the items they are looking for easily (after age verification) and not have to figure out if ebid has adults only items. Doing it this way, "Adults Only" items are hidden but not too hidden that those adults who need them won't be able to find them either.
Subcategories for "Adults Only" could include condoms, lubricant, pumps/penis extenders, vibrators, dildos, masturbators, dolls, adult books, adult dvds, extremely sexy lingeries, adult games . Vibrators and masturbators could be subcategorized again with discreet types and those realistic looking.
Also, if you do place Adults Only in a category by itself, will it be possible for you to suggest "Adults Only" category to people who search for vibrators, sex toys, dildo, masturbators or blow up dolls instead of showing 0 (zero) items found or showing only items that are not sexually oriented? This way, people will know ebid has those items but that one needs their age verified before they could see those available items. Currently, when people type in the word sex toys, it will show lubricants or book with keywords sex and toy somewhere on the title. Why not suggest to people that they can find sex toys like vibrators/dildos in the new Adult Category?
Thanks for reading this far.