Hello dear.. Regarding the problem of Erectile dysfunction, it is due to decreased blood supply to the penis. Though medications are available, like Sildenafil citrate, which increase blood flow to penis & maintains erection, they should be taken under the guidance of a Doctor. It can be improved by having a diet rich in fruits, vegetables, fish, nuts & honey. Studies have also shown that erectile dysfunction is also related to anxiety. So...tell your husband not to worry & stay relaxed during the intercourse. Avoid smoking & alcohol. He can also do oil massage of the penis...it increases blood flow & maintains the erection. One more thing...he should avoid consuming any over the counter medication which claim to improve performance...it may be harmful. Wishing a Healthy Life. Take care.