I've also put this under 'Specific Contributions' to help out 'Older Generation'
It seemed to me it would go well here, too, even for younger guys. I wish I'd discovered this years ago!
I occasionally have a problem getting a hard-on, so here's my favorite method to get off:
I bought a Hitachi HVT-350 Double-Headed Massager (about $100) and laying on my back and with the setting on low, I put my dick between the two heads, one on the top of my dick and one on bottom, and slowly pump the massager up and down, increasing the speed as I reach the 'point of no return.'
Since I sometimes can't get it up, I put several strong rubber bands around the base of the two heads forcing them closer together so the the space grips my dick tighter. You can adjust the space with more or less rubber bands or moving the bands up or down the bases. I use those thick kind that come around bunches of asparagus. Usually four or five will do.
I've never had this fail me. It almost always gets me hard, or even if it doesn't, I still am able to get an terrific orgasm. By adjusting the heads right, I can get it positioned so that it grips just under my knob and the sensation is unbelievable, the best orgasms I've ever had, except maybe getting deep-throated by an expert.
And if you practice a lot (I do!), you can use this technique to 'edge', either prolonging your session to an eventual crashing orgasm or bringing yourself to the brink and then backing off as many times as you want.
Two words of advice;
Be sure to have a towel or something to catch the cum so you don't get it all over the heads. Or be willing to wash the heads off every time to avoid grossness. (There's nothing like the smell of stale cum!)
Don't get too rambunctious! You can rub your dick raw, if you're not careful and it takes a couple of days to heal.
I know a hundred dollars is a lot of money, but trust me, if you're having a 'problem', this is worth it.
If you try it, let me know how it goes for you. And if you discover something new with this, share it!