When Is It Moral To Have Sex?

Kant is famous, among other things, for trying to put morality onto a rational basis.

Today, Kantian ethics is a top-three ethical framework, alongside utilitarianism and virtue ethics.

But Kant's rigid application of the Categorical Imperative has not aged so well.

In 1755, Immanuel Kant (1724-1804) became a Privatdozent, or non-stipendiary lecturer, making a living by charging students for his lectures and giving private tuition. His students joked that he could cover for the entire philosophy faculty—which at the time included everything except the three “higher” faculties of theology, law, and medicine. He became a star lecturer, reputed for his wit, dry humour, and poker face.

When he lectured, Kant was, according to a contemporary account, “all things to all men.” He stood at a diminutive five foot two (1.57m), with blond hair, blue eyes, and rosy cheeks. Despite his slender build, flat and narrow chest, and “slight corkscrew twist,” he was described as attractive. According to his own account, his flat and narrow chest left “little room for the movement of the heart and lungs”, contributing to his delicate constitution, predisposition to hypochondria, and sedentary, regimented lifestyle.

Kant compensated for his physical frailties by being a sharp dresser. He took inspiration from nature for matching colours. Thus, in middle age, he often wore a yellow waistcoat with a brown tailcoat trimmed with gold braid. In public and in company, he sported a powdered wig, even after it had fallen out of fashion. As late as 1791, his friend and follower Joachim Christian Friedrich Schulz described him as having “the look of a good, honest watchmaker who has gone into retirement”.

From 1766, Kant derived a modest but........

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