Was in Budapest last month and visited Rudas baths on men only day. I got impression it was mostly locals who were regular there. I did not see any particularly hot fit guys naked there. You have to wear apron but you take it off in sauna and sit on it so you do see guy For guys looking gor fun i cant see it being possible tho one guy when i was leaving started wanking off infront of me in shower.
This week i was in prague and visited Podoli pool. Really good. See loads of naked guys. Czech guys have no problem getting naked. It is very busy pool has a 50m pool and a lot of the swimmers will stop in steam in mens after. Some get completely naked in steam but if they dont they will in showers after. Also a corridor going from mens changing area to the shower area and a lot walk through it naked. I saw some really hot guys naked there.
Also visited Sutka pool. A very busy shower area too but the changing area is coed. There seems to be more kids there tho as has a fun water park attached. The naked sauna upstairs is small and dark and not many seem to use it. Both Sutka and podoli are great for looking. Neither are cruising so dont go if looking for fun but guys there do check you out in a nonchalant way.