If those arteries are inflamed and/or clogged, then you don't have proper blood flow. And that means you don't have enough nitric oxide to open up your arteries, so you can't get an erection because you can't get blood into your penis. Plus, without an engorged penis, the veins that drain the blood don't kink off, so whatever meager blood enters the organ quickly spills back out.
That's why erectile problems, for the most part, aren't manhood problems or mental problems. They're plumbing problems that require you not only to be turned on but to have the right biological faucets turned on as well.
Find out more about this book:You: Staying Young: The Owner's Manual for Extending Your Warranty