This passage (along with most of the sutra fo 42 chapters) was absorbed into the compilation of daoist revelations called the Zhen'gao (from Bokenkamp's A Fourth-Century Daoist Family, pg 161) This is not entirely incongruous. in other parts of the zhen'gao, the daoist gods repeatedly...

... inform their students that daoist sexual alchemical practises backfired most of the time, shortening their practitioner's lifespans rather than making them transcendents. The ideal mode of life is celibacy; the perfected repeatedly persuade their students to give up family life