Although male chimpanzees and monkeys do masturbate, they tend not to reach orgasm and ejaculation, giving rise to a saucy interpretation. https://books.google.de/books?id=ZviFDwAAQBAJ&pg=PA673&lpg=PA673&dq=%22sexuality,+reproduction,+and+birth%22+schiefenh%C3%B6vel&source=bl&ots=BYY-yVfoMW&sig=ACfU3U1AZMtHfbiigB2FsUJVeffLdtw9Gg&hl=de&sa=X&sqi=2&ved=2ahUKEwiZ0YKs_qjgAhWpUhUIHU67DKMQ6AEwAHoECAMQAQ#v=onepage&q=%22sexuality%2C%20reproduction%2C%20and%20birth%22%20schiefenh%C3%B6vel&f=false …pic.twitter.com/VkrmibgZI6