[Solved] The number of hours worked by American labor has A) an upward trend over time, but has fluctuated with the business cycle. B) no apparent trend over time because of the ravages of the business cycle. C) trended upward over the last two decades despite a marked decline from 1975 through 1979. D) declined over the past 15 years because of the four recessions suffered by the American economy. E) none of the above. Sexual Diseases: Infections that are primarily transmitted through sexual contact, also known as sexually transmitted infections (STIs). Virginity: A term that traditionally refers to the state of not having engaged in sexual intercourse, often associated with cultural, religious, or moral significance. Sexual Intercourse: The physical act between individuals that involves the genitalia and is often performed for reproduction or pleasure. Autoeroticism: Arousal of sexual feeling without an external stimulus.