Hello and thanks for your question. Many men ejaculate in less than five minutes, so this is likely not classified as premature ejaculation, which typically happens within seconds. If you are experiencing difficulty obtaining or maintaining an erection, I can see two problems immediately. One is smoking, which is any amount can contribute to erectile problems. Second, if you are trying to have sex while drinking alcohol, you will likely have erectile difficulties because of the alcohol. If you refrain from smoking and drinking and the problem persists, you should seek consultation with a urologist or psychiatrist, as this is generally a very treatable problem. Dr. Sheppe