I am 21 years old and have had steady girl friends, i.e. steady sex for almost the past 6 years. Within the past 2 weeks I've had three different occasions where I could not get or maintain a strong enough erection to continue. Twice after the malfunction I was able to get things together and still take care of things. I still can become erect and it only happens some times, but has become more frequent (twice within a 24 hour period) and I seem to be les turned on lately. I was wondering if there is anything I could do and if anyone had advice.

Also I've heard Zinc to increase the blood flow, does Zinc actually work or is that an urban legend sort of thing?