Problem maintainig an erection

Dear Ask The Doctor: When my girl and I get into the act of having sex i am hard but once the intercourse starts and i get close to cumming i go limp.its really frustrating and my girl is begining to think im not attracted to her.what could be causeing this problem,please help

Dear Chris: Your porblem is not unique. There are many young men who suffer from similar erectile issues. Most importantly do not despair. Most erectile dysfunction issues result from psychological factors, however, a physical disease affecting the penis must first be ruled out. It is best to talk to physician with whom you are comfortable so that he/she may examine you as well. Once a physical disease has been ruled out there are a number of techniques that can be employed to help you work though this issue.