" As intellectuals they were brilliant, incisive, prescient, and creative (but also elitist, cantankerous, impatient, and conspiratorial). As friends they were bawdy, foulmouthed, and adolescent. They loved to smoke (Engels a pipe, Marx cigars), drink until dawn (Engels fine wine and ale, Marx whatever was available), gossip (mostly about the sexual proclivities of their acquaintances), and roar with laughter (usually at the expense of their enemies, and in Marx’s case until tears streamed down his cheeks). "

― Mary Gabriel , Love and Capital: Karl and Jenny Marx and the Birth of a Revolution