The Description of the Human Body He believed the heat of the heart somehow caused all movement of the body. Blood vessels he realized were pipes, he saw that veins carried digested food to the heart. (This was brought further by William Harvey. Harvey developed the idea of the circulation of the blood.) Descartes felt that an energetic part of blood went to the brain and there gave the brain a special type of air imbued with vital force that enabled the brain to experience, think and imagine. This special air then went through the nerves to the muscles enabling them to move. The Description of
Anarchism and issues related to love and sex homosexuals in France: "The harshest [criticisms] came from Marxists, who tend seriously to underestimate the form of oppression which is antisexual terrorism. I expected it, of course, and I knew that in publishing my book I was running the risk of being attacked by those to whom I feel closest on a political level." Later sexual anarchists continued in that vein. In 1993, the "Boston Anarchist Drinking Brigade" criticized "anti-porn activists who are frankly censorious." Emile Armand advocated naturism (see anarcho-naturism) and polyamory. He also called for forming voluntary associations for purely sexual purposes of heterosexual, homosexual, or bisexual nature