*Image by the talented Jem Magbanua
Safe sex in classical Chinese thought is sex that does not drain the body of needed energy and vitality, but increases it.
Chinese Medical history is long and traverses time, to places where cultural norms were quite different.
The Eastern wisdom traditions of both Dao & Tantra say sexual energy is a possible pathway for awakening consciousness, divine enlightenment and healing.
That is what imbibes the language that they use to describe the body.