I’ve developed into a long laster over the years however years ago I tried MagnaRx and I darn near couldn’t finish. Also because I go to the gym and stay fit (also take supplements) that increases my staying power. One little trick that you may wanna use is if you are about to finish switch up to oral for a few mins. This keeps you hard but it really works wonders for making you last longer. If you do this a few times you can suppress your urge to finish.this is just my experience. Plus it gives your girl some extra form of stimulation. I love doing it, it makes my gf go nuts. Alcohol always works and this is gonna sound weird but drink a lot of water and don’t flush your system before sex (just don’t flush on her). It tends to desensitize you a bit and allows you to last longer. These are the experiences I’ve had, hope this helps you.