Nagel's essay argues for the wholly subjective character of experience, and how this subjectivity is dictated by differences in the physicality of beings. A creature shapes its Umwelt, or lifeworld, through its interactions with the world, and those interactions are determined by that creature's body. Men and women inhabit similar yet profoundly different Umwelts. The qualia of sensation — meaning the instances of subjective experience, such as what it's like to perceive a colour, to taste an apple or hear a baby cry — are different for each individual human. But these differences are also sexed. The last is a good example, as the female body — and therefore mind — responds to a baby's cry in a radically different way to a man's. But there are also large differences in the way they experience running for five hundred metres, the colour red, having a nipple touched, and innumerable other things (almost everything, in fact). There are qualia that each sex experiences that the other will never be able experience at all, but which help form their consciousnesses. A woman will never get an erection, and a man will never have a clitoral or vaginal orgasm, menstruate or give birth.
Comment: Tina Peters was/is a political prisoner who was jailed for doing her job. It's a travesty that it has taken this long to free her from the hellhole she was thrown in.