Final answer:
Sexual desire in men is influenced by testosterone levels, which can increase with sexual desire. Men do experience a decline in testosterone levels as they age. Contrary to women, men do not experience cyclic fluctuations in their sex hormone levels. Hormonal levels in men may require medical treatment when there is a hormonal imbalance or deficiency.
Step-by-step explanation:
Sexual desire in men is influenced by the hormone testosterone. Contrary to statement c, men do not experience cyclic fluctuations in their level of sex hormones like women. Statement d is also inaccurate as hormonal levels in men may require medical treatment, especially if there is a hormonal imbalance or deficiency.
Statement a is accurate. Sexual desire can increase testosterone levels in men. When sexual desire is stimulated, it triggers the release of hormones, including testosterone. Higher levels of testosterone can then further enhance sexual desire.
Regarding statement b, as men age, their testosterone levels do indeed decrease. This decline in testosterone levels is a natural part of the aging process and is often referred to as andropause or male menopause. Lower testosterone levels can impact sexual desire and function in older men.