Final answer:
The decline in frequency of sexual activity in late adulthood can be attributed to natural factors such as hormonal changes and physical changes associated with aging.
Step-by-step explanation:
As individuals age, both men and women may experience a decline in sexual activity. In late adulthood, this decline in frequency of sexual activity can stem from various factors.
For men, the decline can be attributed to the natural decrease in testosterone levels, which can lead to symptoms of andropause or male menopause. These symptoms may include fatigue, reduced muscle mass, depression, anxiety, loss of libido, and sexual dysfunction.
For women, the decline in sexual activity can be influenced by factors such as the relief from the fear of unwanted pregnancy, children being grown and independent, as well as the possible impact of physical changes associated with aging.