I am 29 yrs of age. Must say i've had many,many sexual partners. Never had a problem before. I get reular errections in the mornings, and I get regular erections whem getting intimate. My problem lately is that it doesn't last like it should. I'm not sure if its mental or what. Its messing me up mentally. My girlfriend which I love thinks its her fault and its braking my heart. If anyone has any info. Please let me know....Thanks