Not with the search box. You cannot even find creators with adult content there.
But the setting is bugged. I told them many times, but they ignore the issue. "( ) Show content marked as adult in search & browse".
As a user, I expect to not see such content in browse, unless that tick box is ticked, and for that I need to log in, promising itch, that I am 18+ or whatever they ask at account creation. Granted, I fail to find the info that adult content is not shown otherwise, but for search it works. Why does it not work for browse?
You just need to select any of the adult tags. Like adult itself. Now you can browse all the adult games that have tagged adult.
That works for not logged in, as well as for logged in and not selected the tick box.