Synthesis Writing. Although at its most basic level a synthesis involves combining two or more summaries, synthesis writing is more difficult than it might at first appear because this combining must be done in a meaningful way and the final essay must generally be thesis-driven.
1. Endocrine Diseases. The bodyâs endocrine system produces hormones that regulate metabolism, sexual function, reproduction, mood, and much more. Diabetes is an example of an endocrine disease that can cause men to experience impotence. Diabetes affects the bodyâs ability to utilize the hormone insulin.
Male sexuality problems. In older men, erectile dysfunction usually has a physical cause, such as disease, injury, or side effects of medications. Any disorder that causes injury to the nerves or impairs blood flow to the penis can cause erectile dysfunction. This condition increases with age: about 5 percent of men in their 40s and between 15 and 25 percent of men over 65 experience erectile dysfunction.