Hello, according to your description, the lack of hardness of the penis after erection is considered by Chinese medicine may be caused by the lack of yang qi in the kidney. In the theory of Chinese medicine, the kidney is the main reproductive, so the erection is not firm, or firm but soon the situation can be this aspect of the treatment.

Suggestions: The above analysis, it is recommended to find a traditional Chinese medicine, according to the specific tongue and moss, pulse and other conditions of comprehensive analysis, if it is indeed the above situation, you can consider the use of complementary yang qi of traditional Chinese medicine to regulate, such as gui fu dihuangwan, right to return to the pill, and so on.

I hope my answer is helpful to you, and I wish you good health!

I hope my answer will help you.