I think yes; nothing that's strictly for sale, and nothing underage.
Booru is just an image gallery website. Anyone can upload to it. Most famously Gelbooru, which is just every anime titty picture they can find. It has some wrestling stuff but it's strictly Japanese art.
Then there's a site to make your own galleries; shortybooru, musclebooru, joi booru. Presumably this would be some kind of catfightbooru?