Yup, weird, but cute. And also hilarious, e.g. the author's comment regarding page 13: "The sun began to shine just at the right time so I could sell this to all ages"
Btw, in Germany it is also common for men and women to go to the sauna together. Public saunas sometimes have a women only sauna as well, but there's always mixed areas, too. So it's not even just family, yup, you see strangers naked. Plus, you don't wrap in towels or wear bathing clothes (both would not be ideal for heat circulation, potentially unhealthy/risky). I don't get why that's such a big deal in some countries.