I am 70 years old. I can get erection when lying on my back. But I lose it when I change posture, like being on top, lying sideways, sitting or standing. Any suggestions? Intercourse with woman on top is not emotionally acceptable to us.
You caught me on the emotional acceptability issue. I am very curious about that statement and would be interested in hearing more in order to understand what the dilemna is. If there are no position changes that allow you to retain an erection, you and your partner may need to address this with a professional unless you are willing to give up intercourse. I assume that you both enjoy it enough to want to find a solution, whether that's religious or psychological.
Have you tried penetration with your partner on top while you have an eretion and they while you are inside of her and already aroused gently flipping over? That might be the best compromise to accomodate both your needs and her needs and the "comfort of position" that you are looking for.