[Solved] After exposure to thirty minutes of sexually explicit film, or erotic but not sexually explicit film, sexual arousal is measured in female and male subjects with a penile strain gauge or a vaginal photoplethysmograph. What is the independent variable in this study? A)Sexually explicit films B)The penile strain gauge or vaginal photoplethysmograph C)Gender D)Amount of sexual arousal Endorphins: Neurotransmitters produced by the body to relieve pain and stress, often associated with feelings of euphoria. Prolonged Stress: Extended exposure to stressful situations or stimuli, which can have negative long-term effects on health and well-being. Aerobic Exercise: Physical activity that improves cardiovascular health by increasing the heart rate and maximizing the amount of oxygen in the blood. Stress-Moderating Hormone: Hormones that play a role in the body's response to stress, helping to regulate or moderate the stress response.