I haven't used tumblr much, but while looking for things to post about here, I discovered a hot tumblr site called Bear and Hairy. And if you like big-bellied, hairy bears, you need to check out this site.
There are so many good-looking hairy men and most of these guys are packing bellies, although there are a few muscle bear types, too. Lots of cute and cuddly cubs, too. You find lots of face shots, but plenty of full-body nude or dick photos, too. Hmmm ... I'm going to have to do some more exploring on tumblr ... where there's one hot site, I'm sure there are loads of others.