And the conclusion reached by van Gulik after dozens of years of exhaustive research was--sex life in ancient China was normal and natural. Notwithstanding the appearance of Taoist sex manuals, it was in fact the constant efforts of Chinese people over some 2,000 years in studying how to balance relations between the sexes that enabled them to maintain their vitality and continue and renew the race.
而高羅佩窮十數年研究所得的結論則是：中國古代兩性生活自然而正常，雖有道家「房中術」的出現，但正因為中國人兩千年來不斷致力研究兩性均衡，所以始終維持了強烈的生命力，使中國民族能持續而更新。