Hi, mine is a peculiar case I think. Usually my penis will be strong while watching the sex videos or when I do foreplay with my partner. Some time it will be hard for 1hr or so. But, when I finish foreplay or without foreplay also, when I start to put my penis into my partner it is getting soft. Sometimes when I remove my cloths suddenly it will get soft. Some time I almost get into my partner, then it will suddenly become soft. Don't know why it is happening. I tried to get it in to my partner without going for foreplay also, I mean once it get harder immediately I tried but then also it became soft. Please give me some suggestions, why is it happening like that. are the any medicine or anything else which I can try to get rid of this problem.
It can be due to psychological causes, erection dysfunction, relationship problems, abnormal hormone levels, abnormal reflex activity of the ejaculatory system, thyroid disorder, inflammation and infection of prostate or urethra. You should go for a clinical examination and blood test to check for testosterone level etc for diagnosis.
I sincerely hope that helps. Take care and please do keep me posted on how you are doing.