Hello friend, Your condition is called Erectile dysfunction. There can be a number of reasons for the weakness of the penis that does not enable you to penetrate your penis into the vagina of your sex partner during intercourse. Most probably your condition must be because of performance anxiety. This occurs mainly in persons who go for sex with girls other than your wife or your regular partner. If you are under medication with chemo drugs you can have nervous weaknesses and cause this condition. Medications of the types like antidepressants, antipsychotics, antihypertensives, antiulcer drugs, hyperlipidemia medications etc can cause these conditions. Even patients under Cancer treatment experience poor erection. Certain neurological disease like Epilepsy, Multiple Sclerosis, Guillain barre syndrome, Alzheimer s disease, etc. also produce this condition but with evident symptomatology, which in your case is not suitable, I feel. Poor nutrition, can also be a cause. Certain physical abnormalities like Hypogonadism, epispadiasis etc. can also cause the condition. It is better to personally consult a physician at the earliest or come on with the details of your physical conditions so that I can advise you further. For any disease condition, the mind of the individual is also very important as the physical. I am a Homoeopath and so advise you to consult a n expert Homoeopath at the earliest for recovery. Homoeopathy has got several very effective medicines for your condition. But a detailed case taking is required to understand your mental make up, physical make up etc. to understand you as a person and prescribe your genetic individual remedy to cure you. With best wishes for a speedy recovery through Homoeopathy, Dr. C. J. Varghese Homoeopath drcjvarghese@gmail.com