Insufficient hardness, too short duration of sex - is it kidney deficiency?

Patient's question:

Insufficient hardness, too short duration of sex

Doctor's answer:

From the patient's description, from a traditional Chinese medicine perspective, the patient should be diagnosed with kidney deficiency. The patient can focus on self-cultivation and engage in moderate physical exercise daily to enhance immunity. For diet, the patient generally has a negative constitution and should consume more black-colored foods while reducing the intake of warm and dry foods such as dog meat. Additionally, the patient can take oral medications like Liuwei Dihuang Wan.