Armand was an important propagandist of free love. He advocated free love, naturism and polyamory in what he termed "la camaraderie amoureuse". Above all he advocated a pluralism in sex and love matters in which one could find "Here sexual union and family, there freedom or promiscuity". He wrote many propagandist articles on this subject such as "De la liberté sexuelle" (1907) where he advocated not only a vague free love but also multiple partners, which he called "plural love". In the individualist anarchist journal "L'EnDehors", he and others continued in this way. Armand seized this opportunity to outline his theses supporting revolutionary sexualism and camaraderie amoureuse that differed from the traditional views of the partisans of free love in several respects.