[Solved] The embryonic germ layer of tissue in animals that develops into the skin and nervous system is the A) pachyderm. B) endoderm. C) mesoderm. D) protoderm. E) ectoderm. Genitals: The organs of the reproductive system, especially those external to the body such as the penis and vulva. Voyeurism: A sexual disorder in which an individual gains sexual pleasure from observing unsuspecting people who are naked, undressing, or engaging in sexual activities. Exhibitionism: A psychological condition or behavior where individuals have a compulsion to expose their genitals to others in inappropriate settings for sexual gratification. Sexual Sadism: A psychological disorder characterized by deriving pleasure from inflicting pain, suffering, or humiliation on others.