Every series has baths or hot springs. More rare are co-ed baths/springs (not just accidental), with both genders happily naked together though perhaps surprized or somewhat embarassed.
Name all such series here.
Pic: Ikkitousen bath scene, there's a hot spring episode later, Hakufu isn't too embarassed.
>Every series has baths or hot springs
But that's wrong.
*every series longer than 3 episodes