Other than larger brain / greater intelligence,  which single behavioral or biological innovation / adaptation unique to the genus Homo (bipedalism, thumbs etc are NOT unique to Homo) do you think furthest propelled the genus Homo evolutionarily, and why

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Sexual Motivation

Sexual motivation refers to a person's overall desire for sexual activity. It is an unusual motivation. Generally, among lower animals, the term 'drive' is commonly referred to as sexual motivation. It means a certain internal force drags the animal to be involved in reproductive behavior. On the contrary, humans are not simply driven by any internal force; rather, the sexual motivation in humans is due to several factors such as biological (hormones, genes), environmental (familial upbringing, chemical exposure) and physiological factors (culture, desire) which further determine engagement in sexual activities.