Sartre explains that "the look" is the basis for sexual desire, declaring that a biological motivation for sex does not exist. Instead, "double reciprocal incarnation" is a form of mutual awareness which Sartre takes to be at the heart of the sexual experience. This involves the mutual recognition of subjectivity of some sort, as Sartre describes: "I make myself flesh in order to impel the Other to realize for herself and for me her own flesh. My caress causes my flesh to be born for me insofar as it is for the Other flesh causing her to be born as flesh."