Because fangzhongshu involves difficult techniques requiring the use of qigong to guide the qi and train the body, it requires an instructor, and for this reason since ancient times it has always been an "art transmitted in secret."
由於房中術必須配合氣功導氣引體的修煉，技術相當困難，必須有人指導，因此自古迄今都是一種「秘傳的知識」。