I am a 40-year-old man, happily married with two children. I lead a healthy life while maintaining personal and professional balance. I had no diseases. All medical reports including sugar and BP are normal. Of late, my erection is not as firm as it was before. I get an erection but need continuous stimulation to maintain it. Sometimes a little delay in penetration (due to foreplay) results in loss of erection which is really embarrassing. I do not have a problem of ejaculation and once I am having sex, I can hold it as long as I want to. Once in a group sex as well with another partner, I had the similar issue of erection. Has my libido gone down? Apart from your advice of exercise and healthy life style (which anyway I am leading) could you please advise any medication needed?