I'm 51 yrs old and my gf is 23. I have no issues getting a hard on but I seem to have developed a premature ejaculation problem. I've NEVER had any such problems with any of the other women I've dated and certainly not with my ex wife, on the rare occasions the woman let me in , I would last about 15 mins plus. Now that stamina seems to have gone out the window. My gf is just so incredibly tight and I can't hold myself for longer than 3 minutes. I have tried techniques like masturbating beforehand, thinking nonsexual thoughts, and actually even stopping pumping her in the middle of sex.. Nothing seems to help. She seems satisfied with oral but I want us to have some good sex. Will Viagra help in this situation?