性せい本ほん能のうMeanings1nounsex instinct; sexual instinctRefers to the innate biological drive for sexual behavior. Often used in psychological or biological contexts.性せい本ほん能のうは人にん間げんの基き本ほん的てきな欲よっ求きゅうの一ひとつだ。The sex instinct is one of the basic human drives.