[Solved] If the real value of an item bought ten years ago is less than it's nominal value at that time, what can one infer about the change in the overall price level during this ten year period? Havelock Ellis: A pioneering British sexologist and author known for his studies and writings on human sexuality in the late 19th and early 20th centuries. Masturbation: The act of self-stimulation of one's own genitalia, frequently leading to climax. Krafft-Ebing: refers to Richard von Krafft-Ebing, a 19th-century psychiatrist and author known for his research in human sexuality. Human Sexuality: An area of study and aspect of human life that encompasses sex, gender identities and roles, sexual orientation, eroticism, pleasure, intimacy, and reproduction.