A couple questions: First, how old are you? Younger guys often have a very short 'refractory period' before getting another erection, but that tends to get longer with age, so for example if went for 2 within 15-20 min at age 22, by age 35 or 40, it might take quite a bit longer. That's normal, nothing to worry about. Another related Q: how soon are you trying for a 2nd round - 15 min? 30? an hr? 3rd Q: how often do you masturbate, and when you do, if you would go for another round, how long would it take you to get aroused again? It usually IS a little easier by yourself, because you know exactly how to stimulate yourself the 'right way'. If you're over 35, this is probably not that much to worry about, it would be considered mostly normal. But without this answers to these questions, it's hard to give a good answer...