Hello, I am having trouble maintaining erection from past 8 months. In starting I have enough erection to start the intercourse. - While in between the intercourse my penis looses erection, even before I have ejaculated. - Some times I pre ejaculate and the sex is interupted. Due to these reasons I am not able to satisfy my partner. I am hardly able to do for 1min to 2min. I have stop smoking around 6 months back but at time I do have 1 or 2 in a month. I have been going for gym from past 3 months now hoping these steps might help me improve my performance and satisfy her. Could some one tell me what other reasons be there for not being able to maintain the erection. Thank you in advance for your advice.