When I was a kid, 37C was a fever. And it felt like a fever too. I've never had 37C body temperature without feeling that there was absolutely something wrong with my body. If Europeans and Americans genuinely don't consider 37C a feverish temperature....I'm surprised.
Huh, Ayaharem. That's new. Please disregard that harem rant I did in the NaruMari image! Now we're only missing Hatate from the "people Aya is commonly paired with" list.
North European here. I was always taught that 37 was the normal, healthy temperature, both in textbooks and by my parents. Anything over 37.5 was a fever, anything below 37 was also a sign of sickness.