I am 60,obese, with high blood pressure and cholesterol, I hadn’t had sex withy my ex-wife for eight years and so I masturbated regularly over sexy images of women. I have only ever had sex with my wife. Now that I am divorced from my wife I have discovered to my amazement that a beautiful , slim, sexy and very experienced lady of 52 has fallen in love with me. We have had sex quite often, which she always initiates, in bed she reaches for my penis almost immediately and I think, initially, she was rather surprised that it didn’t spring into action like a switchblade. In fact I have severe erection problems or cannot hold the erection long enough for satisfactory intercourse. She is so understanding and we have great oral sex! But sex takes place in the head, and I know I am intimidated by her experience of other men, and by her beauty, and that hasn’t helped, and yet I know I should be aroused by her but often I’m not. I’m scared that having masturbated over images and ,of course fantasies, has made normal sexual thoughts impossible for me. I just don’t appear to have much of a sex drive these days, but I enjoy sex and often wake up with an erection my girlfriend would die for. Is being a physical wreck part of the problem? My girlfriend will not consider marriage until I have lost 25kg. Life is already hard without beer, spirits, ice cream or chocolate and without sex there are few pleasures left , so I would be grateful for your observations and advice.