I am 80 years young and am sharing this with any men interested in the the above topic.
I have been doing this for about 3 years now with great success. NOTE: I AM NOT SELLING ANYTHING. I take 2 each L-Arginine 500 mg capsules/day/every day. This helps increase circulation in the penis and other parts of the body as well. (read up on it) to see.
Now, when I am getting ready to engage in some sex, I do this. even if I am just going to just masturbate BY myself, I use my "FLESH LIGHT, which is wonderful. Someone finally made a GREAT tool for a male. I use the same procedure as I would if I am going to have oral sex or any other sex. I have my Doc Johnson cock ties handy and ready to use. If you have't used one before, try it. You cinch it down on the bottom of your shaft when you are hard or even semi-hard. Do not leave it on more than 30 minutes. After you cum,or just before you cum, you can loosen it. If you are going to go another round then just loosen it, then cinch up again when you are ready. Otherwise just take it off.
IMP: Lastly, 2 hours before your performance, take 2 each of the Leyzene capsules to get your erection started or increase the firmness. This is foreplay time as you will know when it is time to "go to work". Get these items as they work well. I have some friends that have tried this and love the combo. So, it is not just me.