What are the reasons for not secreting lubrication during sexual activity?

Patient's question:

Patient Age: 34
Detailed Condition and Purpose of Consultation: I am a 34-year-old woman, but I almost do not secrete lubrication during sexual activity, which is very painful. How can it be treated?
Duration of Current Illness: 2 years
Current General Condition: There is black discharge after urination, almost no lubrication during sexual activity, very painful, and intermittent lower back pain, as well as low libido.
Medical History: None
Previous Diagnoses, Treatments, and Outcomes: None
Auxiliary Examinations: None

Doctor's answer:

Hello: The reasons for vaginal dryness cannot be explained in a few sentences. It involves a very wide range of factors, including psychological, physiological, sexual life factors, or other factors, etc. Sometimes these factors are interwoven and interconnected.
A normal vagina maintains a certain level of moisture. During the process of sexual arousal leading to climax, due to the accumulation of sexual excitement, the vagina produces secretions from few to more, achieving a high degree of lubrication. These lubricating fluids mainly come from the secretion of the cervix, the exudate formed by congestion of the vaginal walls, and the secretion of the Bartholin's glands located near the vaginal opening. During sexual activity, these fluids are only secreted and gradually increase when sexual excitement reaches a certain level. If sexual excitement is insufficient, these lubricating fluids are secreted less or not at all, naturally leading to vaginal dryness. Some women may not have experienced vaginal dryness before, but it may appear after a special reason, which is often caused by psychological or physiological factors.
1. Psychological factors: Psychological reasons are often related to changes in the environment, mood, and emotional life. For example, work stress, financial difficulties, changes in marital relationships, tension in interpersonal relationships, and other psychological pressures can lead to low sexual desire, delayed sexual arousal, and dull sexual response. Under obvious insufficient sexual excitement, the cervical glands and Bartholin's glands do not secrete, the vaginal walls do not congest, and therefore there is no exudate, resulting in the vagina not being lubricated and becoming dry. Some infertile couples should follow medical advice to complete the "family assignment" during the woman's ovulation period, and at this time