I am a 51 year old man. I have live on my own for the past 3 years, having only one brief relationship. I have found a very attractive and sexy woman. We have finaly got it together in the bedroom. I was sexually aroused and got a good erection during the warm up and oral sex. I lost my erection as soon as started intercourse. This was very embarasing and now I am in fear of it happening again. I am fit, healthy, not on any medication and have nevr had this problem before. I did suffer from depression after the break up of my 16 yr marrage, but I am fine now. PLEASE can anyone help?