I have some american friends who spent their honey moon in japan.
They both love ofuros but had to enjoy the hot water separately.
If you go to an onsen-ryokan, you may have a bathtub in your room also.
But the “real thing” is of course the “dai-yoku-jo” (large bath area) which is separated by sex. Here you can enjoy different temperatures of water, ishiburo (stone-bath) rotenburo (outdoor bath) goemon-buro (wood fired metal bathtub) and all the optionals including waterfalls, softly lit stone lanterns and spectacular foliage.
So my friends were separating, going to their bath area and feeling guilty to indulge longer in the hot water… You do not want to have your newlywed partner say “did you came here to spend time with me or to enjoy the thermal water by yourself?”
Please keep your ears open: there is a trick if you want to love the onsen as much (or almost as much…) as the company of your partner: you can look for a “kazoku-buro”.
Many ryokan offer family bathtubs that can be used for a limited time by your party exclusively.
Some require an extra fee, some others do not. In this case they are usually crowded and you have to reserve well in advance or wait.
Here below are some photos from the hotel “kami-no-yu” (god of hot water) in Yamanashi prefecture. The address is 17, Ryuji, Kai city. telephone: 0551-28-5000.
This one is suitable for a large family!! But do not forget to read the notice before entering…
The ofuro is inside but you can enjoy the landscaped garden from the window!
I cannot here list all ryokans that offer a “kashikiri-kazokuburo” anyway I will share some other reviews in the near future.
Meanwhile, if you are going to japan and want to try this experience, please let me know: I will be glad to look for a suitable ryokan for you.
If you want to do it by yourself, try to access googlemap with the tags selected by clicking the link below:
https://www.google.co.jp/maps/search/%E8%B2%B8%E5%88%87%E5%AE%B6%E6%97%8F%E9%A2%A8%E5%91%82+%E6%B8%A9%E6%B3%89/@35.7192132,134.0200653,5z/data=!3m1!4b1
Then, zoom on the location you choose.
The onsen will be twice as enjoyable if you can share it together with your other half!