Hadaka no tsukiai
or skinship, written  in Japanese syllabaries, is an idea in Japanese culture. It is the idea of spending time together naked. Hadaka no tsukiai friendships are platonic rather than sexual. A family, a group of housewives from the same neighborhood, a group of businessmen, or a group of classmates might spend time together naked at a sentō bathhouse, at an onsen hot spring, or at a health club. This allows opportunities for social bonding. References

Japanese culture
Nudity