“Sex is as personally unique to individuals as it is universal.”

Men Are from Mars, Women Are from Venus

Source: A New Earth: Awakening to Your Life's Purpose

The Need for Transcendence in the Postmodern World (1994)
Context: Until recently, it might have seemed that we were an unhappy bit of mildew on a heavenly body whirling in space among many that have no mildew on them at all. this was something that classical science could explain. Yet, the moment it begins to appear that we are deeply connected to the entire universe, science reaches the outer limits of its powers. Because it is founded on the search for universal laws, it cannot deal with singularity, that is, with uniqueness. The universe is a unique event and a unique story, and so far we are the unique point of that story. But unique events and stories are the domain of poetry, not science. With the formulation of the Anthropic Cosmological Principle, science has found itself on the border between formula and story, between science and myth. In that, however, science has paradoxically returned, in a roundabout way, to man, and offers him — in new clothing — his lost integrity. It does so by anchoring him once more in the cosmos.

Source: The Red Queen (1993), Ch. 1. Human Nature

Source: Man for Himself (1947), Ch. 3; in Ch. 2 of his later work The Art of Loving (1956) a similar statement is made :
Respect is not fear and awe; it denotes, in accordance with the root of the word (respicere = to look at), the ability to see a person as he is, to be aware of his unique individuality. Respect, thus, implies the absence of exploitation. I want the loved person to grow and unfold for his own sake, and in his own ways, and not for the purpose of serving me.

My Autobiography (p. 271 Simon and Schuster 1964 edition)
Context: I am what I am: an individual, unique and different, with a lineal history of an ancestral promptings and urgings, a history of dreams, desires, and of special experiences, of all of which I am the sum total.

Source: The Passionate Life (1983), p. 134

Original: ​Il vero amore consiste nella condivisione delle responsabilità, dell'ascolto, della sincerità, del rispetto, del sesso, della cura, dell'empatia, della pazienza, della progettualità e dell'unicità.
Source: prevale.net