OP should try it. It's not really much about maintaining an erection. It's more how they feel when they're on. Go to a gay sex shop (straight sex shops just won't have the right ones - plus, try asking one of the assistants to give you a fitting) and get fitted for a metal one with a good weight to it. Then get yourself hard - you will immediately notice that your cock is harder, thicker, feel heavier and stronger. You will feel much fuller in the balls, and your entire shaft, right to the back of your balls, will have a much stronger throb to it that makes you feel like you could penetrate a steel wall. Lol. No joke.