[Solved] A significant amount of innovation yields no new products or services because of R&D failure. Sexual Activities: Behaviors involving sexual intercourse or other forms of physical sexual expression between individuals. Romantic Partners: Individuals involved in a romantic relationship with each other, typified by emotional and physical intimacy. Sexual Dysfunctions: Disorders related to any phase of the sexual response cycle, preventing individuals or couples from experiencing satisfaction from sexual activity. Pornography: Explicit visual or written material intended to stimulate sexual excitement.